Seagate CHEETAH 4LP ST34501N User Manual

Cheetah 4LP  
Disc Drive  
ST34501N/W/WC/WD/DC  
Installation Guide  
Cheetah 4LP Installation Guide, Rev. B  
1
Preface  
This manual contains information for users of the Seagate®  
Cheetah 4LP SCSI disc drives. It provides support services, per-  
formance specifications, and initial setup information. Additional  
information is available in the Cheetah 4LP Product Manual (part  
number 83329120). Contact your Seagate sales representative  
if you need to order this publication.  
Attention. This high performance Cheetah disc drive MUST  
have proper power and cooling considerations for  
reliable operation.  
Why is there a difference between 10,000 RPM and 7,200 RPM  
disc drives?  
• Cheetah disc drives spinning at 10,000 RPM will dissipate  
more heat than 7,200 RPM class disc drives (typical power  
dissipation is 22.5 watts).  
• The increased heat is primarily due to increased motor power  
dissipated inside the drive.  
• The increase in heat dissipation requires that the Cheetah  
10,000 RPM disc drives receive more cooling consideration  
than 7,200 RPM class disc drives.  
• Proper consideration of enhanced cooling by conduction (heat  
transfer thru material) can reduce the convection cooling (heat  
transfer by air motion) requirements.  
Note. Please contact Seagate technical support services or  
your distributor’s technical support if you have questions.  
 
2
Cheetah 4LP Installation Guide, Rev. B  
Electrostatic discharge protection  
Caution. Removal of circuit boards by personnel not perform-  
ing depot repair will damage components and may  
void the warranty.  
All drive electronic assemblies are sensitive to static electricity,  
due to the electrostatically sensitive devices used within the  
drive circuitry. Although some devices such as metal-oxide  
semiconductors are extremely sensitive, all semiconductors, as  
well as some resistors and capacitors, may be damaged or  
degraded by exposure to static electricity.  
Electrostatic damage to electronic devices may be caused by  
the direct discharge of a charged conductor or by exposure to  
the static fields surrounding charged objects. To avoid damaging  
drive electronic assemblies, observe the following precautions  
when installing or servicing the drive:  
• Ground yourself to the drive whenever the drive electronics  
are or will be exposed. Connect yourself to ground with a wrist  
strap (Seagate part number 12263496). Connection may be  
made to any grounded metal assembly. As a general rule,  
remember that you and the drive electronics must all be  
grounded to avoid potentially damaging static discharges.  
Turn off the power before removing or installing the DC power  
cable.  
• Do not remove any circuit boards from the drive.  
• Never use an ohmmeter on any circuit boards.  
• When installing the drive on a carrier or tray, discharge the  
carrier or tray prior to inserting it into the system.  
 
Cheetah 4LP Installation Guide, Rev. B  
3
Important safety information and precautions  
Caution. Use forced-air ventilation when bench-testing the  
drive to ensure proper cooling of drive components.  
Use proper safety techniques for safe, reliable operation of this  
unit.  
The procedures in this manual and labels on the unit contain  
warnings and cautions that must be carefully read and followed  
to minimize or eliminate the risk of personal injury. The warnings  
point out conditions or practices that may endanger you or oth-  
ers. The cautions point out conditions or practices that may dam-  
age the unit, possibly making it unsafe for use.  
Always observe the following warnings and precautions:  
• Follow all cautions and warnings in the procedures.  
• Use sound safety practices when operating, installing, or  
removing the unit.  
• Use caution when troubleshooting a unit that has voltages  
present. Turn off power to the unit before removing it.  
• Ensure that the internal temperature of the rack or cabinet  
does not exceed the limits defined for the drive when the drive  
is mounted in an equipment rack or cabinet. When units are  
stacked vertically, pay special attention to the top where tem-  
peratures are usually highest.  
• Follow the precautions listed above in “Electrostatic discharge  
protection.”  
• Do not remove any circuit boards from the drive. Return the  
entire drive for depot repair if any circuit board is defective.  
Removal of circuit boards by personnel not performing depot  
repair will damage components and may void the warranty.  
 
4
Cheetah 4LP Installation Guide, Rev. B  
• Do not separate the head and disc assembly (HDA) from the  
PCB. Return the entire drive for depot repair if the HDA is  
defective.  
• Do not attempt to disassemble the HDA. It is not field repair-  
able. If the sealed HDA is opened by personnel not performing  
depot repair, this will damage components and void the  
warranty.  
As a component, this drive is designed to be installed and oper-  
ated in accordance with UL1950, EN60950, CSA C22.2 950-  
M89, and VDE0805.  
Seagate takes all reasonable steps to ensure that its products  
are certifiable to currently accepted standards. Typical applica-  
tions of these disc drives include customer packaging and sub-  
system design. Safety agencies conditionally certify component  
assemblies, such as the Cheetah disc drive, based on their final  
acceptability in the end-use product. The subsystem designers  
are responsible for meeting these conditions of acceptability in  
obtaining safety-regulatory agency compliance in their end-use  
products and for certifying where required by law. A necessary  
part of meeting safety requirements is the provision for overcur-  
rent protection on drive SELV supply voltages.  
This unit is a component part and as such is not meant to comply  
with FCC or similar national requirements as a stand-alone unit.  
Engineering radiated emissions test results are available  
through the Seagate Safety Department to assist the subsystem  
designer.  
Cheetah 4LP Installation Guide, Rev. B  
5
Wichtige Sicherheitshinweise  
Vorsicht. Beim Testen des Laufwerks auf dem Prüftisch ist  
Fremdbelüftung vorzusehen, um eine ausreichende Kühlung der  
Laufwerkkomponenten sicherzustellen.  
Verwenden Sie geeignete Sicherheits- um den sicheren, zuver-  
lässigen Betrieb dieser Einheit zu gewährleisten.  
Die Verfahren in diesem Handbuch und die Aufkleber auf dem  
Gerät enthalten Warn- und Vorsichtshinweise. Diese Hinweise  
sind sorgfältig durchzulesen und zu beachten, um das Risiko  
von Verletzungen auf ein Mindestmaß zu beschränken oder  
ganz zu vermeiden. Die Warnhinweise machen auf Situationen  
oder Praktiken aufmerksam, die Sie oder andere gefährden  
könnten. Die Vorsichtshinweise machen auf Situationen oder  
Praktiken aufmerksam, die Einheit beschädigen können, so daß  
deren Gebrauch mit Risiko behaftet ist.  
Die Warn- und Vorsichtshinweise sind nicht allumfassend! Es ist  
uns einfach nicht möglich, alle Wartungsmethoden oder die  
eventuellen Risiken jeder Methode zu kennen, zu beurteilen und  
Sie entsprechend zu beraten. Aus diesem Grund haben wir auf  
eine derartige umfassende Beurteilung verzichtet. Falls Sie ein  
hier nicht beschriebenes Verfahren oder Werkzeug verwenden,  
stellen Sie zuerst sicher, daß das gewählte Verfahren weder Ihre  
persönliche Sicherheit noch die Leistung der Einheit gefährdet.  
Beachten Sie in jedem Fall die folgenden Warn-und Vorsicht-  
shinweise:  
• Beachten Sie alle Warn- und Vorsichtshinweise in diesem  
Handbuch.  
 
6
Cheetah 4LP Installation Guide, Rev. B  
Treffen Sie beim Betrieb, bei der Installation oder bei der  
Entfernung der Einheit angemessene Sicherheitsvorkehrun-  
gen.  
• Wenn eine Einheit unter Spannung steht, gehen Sie bei der  
Fehlerdiagnose besonders vorsichtig vor. Schalten Sie die  
Einheit aus, bevor Sie mit den Installations-und Entfernung-  
sarbeiten beginnen.  
• Wenn das Laufwerk in einem Einbaugestell oder Gehäuse  
montiert ist, sorgen Sie dafür, daß die Temperatur im Inneren  
des Gestells oder Gehäuses die für das Laufwerk vorgege-  
benen Grenzwerte nicht übersteigt. Wenn Einheiten vertikal  
übereinander betestigt werden, achten Sie besonders auf den  
oberen Stapelbereich, da dort die Temperatur gewöhnlich am  
höchsten ist.  
• Befolgen Sie die oben unter “Electrostatic Discharge Protec-  
tion” angegebenen Sicherheitsmaßnahmen.  
• Nehmen Sie keine Platinen aus dem Laufwerk. Wenn eine  
Platine defekt ist, muß das gesamte Laufwerk zur Reparatur  
eingeschickt werden. Die Herausnahme von Platinen durch  
andere Personen als die für die werkseitige Reparatur zustän-  
digen kann zu einer Beschädigung der Komponenten und  
Erlöschen des Garantieanspruchs führen.  
• Die vormontierte Kopf- und Festplatteneinheit (HDA) nicht aus  
dem Laufwerkgehäuse nehmen! Falls die HDA beschädigt ist,  
schicken Sie das gesamte Laufwerk zur Reparatur ein.  
• Die HDA ist nicht vor Ort reparierbar und darf nicht auseinan-  
dergenommen werden! Öffnen der versiegelten HDA durch  
andere Personen als die für die werkseitige Reparatur zustän-  
Cheetah 4LP Installation Guide, Rev. B  
7
digen hat eine Beschädigung der Komponenten und  
Erlöschen des Garantieanspruchs zur Folge.  
Als Teilkomponente ist dieses Laufwerk für die Installation und  
den Betrieb in Übereinstimmung mit UL 1950, EN60950, CSA  
C22.2 950-M89 und VDE0805 vorgesehen.  
Seagate ist ständig bemüht, die Zulassungsfähigkeit von  
Seagate-Produkten im Rahmen der gegenwärtig geltenden  
Standards zu gewährleisten. Zu den typischen Anwendungen  
dieser Festplattenwerke zählen Systemeinbau durch den  
Kunden und die Konstruktion von Untersystemen. Sicherheits-  
behörden gewähren eine bedingte Zulassung für Komponenten  
wie das Cheetah-Festplattenlaufwerk vorbehaltlich der endgülti-  
gen Zulasssung im Endprodukt. Designer von Untersystemen  
sind dafür verantwortlich, die Voraussetzungen für die Einhal-  
tung sicherheits- oder aufsichtsbehördlicher Vorschriften in ihren  
Endprodukten und - falls gesetzlich vorgeschrieben - für die  
Zulassung zu schaffen. Eine Grundvoraussetzung zur Einhal-  
tung der Sicherheitsanforderungen ist die Bereitstellung eines  
Überlastschutzes für die SELV-Versorgungsspannungen des  
Laufwerks.  
Dieses Gerät ist eine Baugruppe und unterliegt als solche nicht  
den Anforderungen der FCC oder ähnlicher nationaler Behörden  
für eigenständige Geräte. Technische Testergebnisse zu elek-  
tromagnetische Strahlung sind für Designer von Untersystemen  
auf Anfrage von der Seagate-Sicherheitsabteilung erhältlich.  
8
Cheetah 4LP Installation Guide, Rev. B  
Regulatory agency compliance  
Electromagnetic susceptibility  
As a component assembly, the drive is not required to meet any  
susceptibility performance requirements. It is the responsibility of  
those integrating the drive within their systems to perform those  
tests required and design their system to ensure that equipment  
operating in the same system as the drive or external to the sys-  
tem does not adversely affect the performance of the drive. See  
Table 2, DC power requirements.  
Electromagnetic compliance  
Seagate uses an independent laboratory to confirm compliance  
to the directives/standard(s) for CE Marking and C-Tick Marking.  
The drive was tested in a representative system for typical appli-  
cations. The selected system represents the most popular char-  
acteristics for test platforms. The system configurations include:  
• 486, Pentium, and PowerPC microprocessors  
• 3.5-inch floppy disc drive  
• Keyboard  
• Monitor/display  
• Printer  
• External modem  
• Mouse  
Although the test system with this Seagate model complies to  
the directives/standard(s), we cannot guarantee that all systems  
will comply. The computer manufacturer or system integrator  
shall confirm EMC compliance and provide CE Marking and C-  
Tick Marking for their product.  
 
Cheetah 4LP Installation Guide, Rev. B  
9
Electromagnetic compliance for the European Union  
If this model has the CE Marking it complies with the European  
Union requirements of the Electromagnetic Compatibility Direc-  
tive 89/336/EEC of 03 May 1989 as amended by Directive 92/  
31/EEC of 28 April 1992 and Directive 93/68/EEC of 22 July  
1993.  
Australian C-Tick  
If this model has the C-Tick Marking it complies with the Austra-  
lia/New Zealand Standard AS/NZS3548 1995 and meets the  
Electromagnetic Compatibility (EMC) Framework requirements  
of Australia’s Spectrum Management Agency (SMA).  
10  
Cheetah 4LP Installation Guide, Rev. B  
Seagate technical support services  
If you need assistance installing your drive, consult your dealer.  
Dealers are familiar with their unique system configurations and  
can help you with system conflicts and other technical issues. If  
®
you need additional assistance with your Seagate drive or  
other Seagate products, use one of the Seagate technical sup-  
port services listed below.  
SeaFONE® 1-800-SEAGATE  
Seagate’s 800 number (1-800-732-4283) allows toll-free access  
to automated self-help services, providing answers to commonly  
asked questions, troubleshooting tips, and specifications for disc  
drives and tape drives. This service is available 24 hours daily  
and requires a touch-tone phone. International callers can reach  
this automated self-help service by dialing 408-456-4496.  
Online services  
Using a modem, you can obtain troubleshooting tips, free utility  
programs, drive specifications and jumper settings for Seagate’s  
entire product line. You can also download software for installing  
and analyzing your drive.  
SeaNET™  
You can obtain technical information about Seagate products  
over the Internet from Seagate’s World Wide Web home page  
(http://www.seagate.com) or Seagate’s ftp server (ftp://  
ftp.seagate.com). You can also send E-mail with your questions  
to DiscSupport @ Seagate.com or TapeSupport @  
Seagate.com.  
 
Cheetah 4LP Installation Guide, Rev. B  
11  
Seagate CompuServe forum  
Online technical support for Seagate products is available on  
CompuServe. To access our technical support forum, type go  
seagate. This forum provides information similar to that found on  
SeaBOARD. In addition, you can type questions or browse  
through previous questions and answers on the forum mes-  
sages.  
SeaBOARD®  
SeaBOARD is a computer bulletin board system that contains  
information about Seagate disc and tape drive products and is  
available 24 hours daily. Set your communications software to  
eight data bits, no parity, and one stop bit (8-N-1).  
Location  
Australia  
England  
France  
Germany  
Singapore  
Taiwan  
Phone number  
61-2-9756-2359  
44-1628-478011  
33 1-48 25 35 95  
49-89-140-9331  
TBA  
886-2-719-6075  
662-531-8111  
Disc: 405-936-1600; Tape: 405-936-1630  
Thailand  
USA  
12  
Cheetah 4LP Installation Guide, Rev. B  
FAX services  
SeaFAX®  
You can use a touch-tone telephone to access Seagate’s auto-  
mated FAX system to receive technical support information by  
return FAX. This service is available 24 hours daily.  
Location  
Australia  
England  
USA  
Phone number  
61-2-9756-5170  
44-1628-894084  
1-800-SEAGATE or 408-456-4496  
Seagate technical support FAX  
You can FAX questions or comments to technical support spe-  
cialists 24 hours daily. Responses are sent during business  
hours.  
Location  
Australia  
England  
France  
Phone number  
61-2-9725-4052  
44-1628-890660  
33 1-46 04 42 50  
49-89-1430-5100  
Germany  
Hong Kong 852-2368 7173  
Japan  
81-3-5462-2979  
Korea  
82-2-556-7294/4251  
65-488-7528  
886-2-715-2923  
Singapore  
Taiwan  
USA  
Disc: 405-936-1685; Tape: 405-936-1683  
Cheetah 4LP Installation Guide, Rev. B  
13  
Direct-support services  
Seagate technical support  
For one-on-one help, you can talk to a technical support special-  
ist during local business hours. Before calling, note your system  
configuration and drive model number (STxxxx).  
Location  
Australia  
England  
Phone number  
61-2-9725-3366 (9:00 A.M. to 5:00 P.M., M–F)  
44-1628-894083 (10:00 A.M. to 1:00 P.M.,  
2:00 P.M. to 5:00 P.M., M–F)  
France  
33 1-41 86 10 86 (9:30 A.M. to 12:30 P.M.,  
2:00 P.M. to 5:00 P.M., M–F)  
Germany  
Disc: 49-89-140-9332; Tape: 49-89-140-9333  
(9:30 A.M. to 12:30 P.M., 2:00 P.M. to 4:00 P.M.,  
M–F)  
Hong Kong 852-2368 9918  
Korea  
82-2-556-8241  
Singapore  
65-488-7584 (9:00 A.M. to 12:00 P.M., 2:00 P.M.  
to 5:00 P.M., M–F)  
Taiwan  
USA  
886-2-514-2237  
Please dial 1-800-SEAGATE or 408-456-4496  
for the specific product telephone number.  
(8:00 A.M. to 1:15 P.M., 2:30 P.M. to 7:00 P.M.,  
Central time, M–F)  
SeaTDD™ 405-936-1687  
Using a telecommunications device for the deaf (TDD), you can  
send questions or comments 24 hours daily and exchange mes-  
sages with a technical support specialist between 8:00 A.M. to  
1:15 P.M. and 2:30 P.M. to 7:00 P.M. (Central time) Monday  
through Friday.  
14  
Cheetah 4LP Installation Guide, Rev. B  
Customer service centers  
Seagate direct OEM, Distribution, and Systems Integrator cus-  
tomers should contact their Seagate service representative for  
warranty information. Other customers should contact their place  
of purchase. Seagate offers comprehensive customer support  
for all Seagate drives. These services are available worldwide.  
Location  
Phone number  
FAX number  
Asia Pacific and Australia 65-485-3595  
Europe, Middle East,  
65-485-4980  
and Africa  
Japan  
USA  
Other Americas (Brazil,  
Canada, Mexico)  
31-2031-67300  
81-3-5462-2904 81-3-5462-2979  
1-800-468-3472 405-949-6740  
31-2065-34320  
405-949-6706  
405-949-6738  
Manufacturer’s representatives  
Brazil  
MA Informatica  
55-11-810-7794 55-21-253-6467  
Canada  
Memofix  
Adtech  
905-660-4936  
905-812-8099  
1-800-624-9857  
905-660-8738  
905-812-7807  
Mexico  
Abicom Seamax  
SA DE CV  
525-546-6965  
525-546-4888  
Cheetah 4LP Installation Guide, Rev. B  
15  
General description  
Cheetah 4LP SCSI disc drives are high-speed, random-access  
digital-data storage devices.  
The drive is a component for installation in an enclosure  
designed for the drive. This is often a rack within the system or  
an external enclosure designed to house one or more disc drives  
or other peripheral units. In either case, the disc drive must  
receive adequate cooling (refer to “Providing adequate cooling”)  
and it must be sufficiently grounded and shielded from emis-  
sions. The Cheetah 4LP Product Manual (part number  
83329120) contains guidelines for a properly designed  
enclosure.  
*Model “N” version with 50-pin SCSI I/O connector  
Figure 1. Cheetah 4LP family drive  
 
16  
Cheetah 4LP Installation Guide, Rev. B  
Drive characteristics  
Table 1.  
Characteristics of the various drives covered by this manual are  
given in the following tables.  
Interface type:  
SCSI Fast-20 (also called  
Ultra SCSI1)  
Cylinders (user accessable):  
Disk rotation:  
6,526  
10,033 r/min ±0.5%  
2.99 msec  
Avg. latency:  
Seek time2  
Average read (typical)  
Average write (typical)  
7.7 msec  
8.7 msec  
Internal transfer rate  
(variable with zone)  
122 to 177 Mbits/sec  
Multi-segmented cache  
512 Kbytes  
1Also operates per SCSI-1/SCSI-2/SCSI-3 protocols.  
2Includes on-board controller overhead.  
   
Cheetah 4LP Installation Guide, Rev. B  
17  
Table 1a. Additional drive characteristics  
Legend for following table listing other drive characteristics:  
A = capacity, unformatted, Gbytes  
B = capacity, formatted, Gbytes1  
C = number of read/write data heads  
D = max. synchronous SCSI interface transfer rate, Mbytes/sec  
Model  
A
B
C
8
8
8
8
8
D
ST34501N  
ST34501W  
ST34501WC  
ST34501WD  
ST34501DC  
6,008  
6,008  
6,008  
6,008  
6,008  
4,550  
4,550  
4,550  
4,550  
4,550  
20  
40  
40  
40  
40  
1Standard OEM units formatted with 512 bytes per sector. The  
drive is divided into six-cylinder-wide regions. Each region has  
54 spares when formatted for 512-byte sectors.  
 
18  
Cheetah 4LP Installation Guide, Rev. B  
DC power requirements (Amps)  
Table 2.  
ST34501  
N, W, WC models WD, DC models  
+5V8, 10 +12V8  
+5V8  
+12V8  
Voltage regulation5  
± 5%  
0.88  
0.81  
± 5%2  
± 5%  
± 5%2  
Max. start current  
Peak DC 3, 6, 9  
2.2  
0.89  
0.72  
2.2  
Delayed motor start  
(max)1, 4  
0.08  
0.08  
Peak operating current  
Typical DC 1  
0.85  
0.9  
0.89  
0.94  
1.98  
1.05  
1.09  
0.89  
0.94  
1.98  
Maximum DC 1  
Maximum (peak) AC 7 1.0  
1 Measured with an average reading DC ammeter. Instanta-  
neous +12V current peaks will exceed these values.  
2 A –10% tolerance is permissible during initial start of the spin-  
dle but must return to ±5% before reaching 10,000 RPM. The  
±5% must be maintained after the drive signifies that its  
power-up sequence has been completed and that the drive is  
able to accept selection by the host initiator.  
3 See the +12V current profile in the Cheetah 4LP Product Man-  
ual (publication number 83329120).  
4 This condition occurs when the Motor Start option is enabled  
and the drive has not yet received a Start Motor command.  
         
Cheetah 4LP Installation Guide, Rev. B  
19  
5 See “Conducted noise immunity” in the Cheetah 4LP Product  
Manual. The specified voltage tolerance is inclusive of ripple,  
noise, and transient response.  
6 At power-up, the motor current regulator limits the +12V cur-  
rent to an average value of less than value shown in table,  
although instantaneous peaks may exceed this value. These  
peaks should measure 5 msec duration or less.  
7 Minimum current loading for each supply voltage is not less  
than 4% of the maximum operating current shown.  
8 Use separate ground returns for +5V and +12V supplies.  
9 Where power is provided to multiple drives from a common  
supply, carefully consider individual-drive power requirements.  
Where multiple units are powered on simultaneously, be sure  
the peak starting current is available to each device.  
10 No terminator power. See 11.7.3.4 in the Cheetah 4LP Prod-  
uct Manual.  
Table 3.  
Dimensions of the drive  
mm  
in  
Height 1.00  
Width 4.00  
Depth 5.75  
25.4  
101.6  
146.05  
Weight 1.3 lb (0.59 kg)  
           
20  
Cheetah 4LP Installation Guide, Rev. B  
Initial setup information  
The general information beginning on this page applies to all of  
the Cheetah 4LP drive models. After reading the general infor-  
mation topics, refer to the appropriate drive-specific section  
listed below for additional information about configuring and  
installing your particular model.  
Drive models  
Page  
ST34501N  
39  
ST34501W/WD  
ST34501WC/DC  
43  
48  
General information  
The following general information topics are discussed:  
• SCSI ID jumpers  
• Drive termination  
Terminator power  
• Interface drivers and data path width notes  
• Other applicable jumper options  
• Providing adequate cooling  
• Mounting the drive and connecting cables1  
• Formatting the drive  
1This mounting procedure does not apply to “WC” or “DC” model  
drives. To mount a “WC” or “DC” drive, plug the drive into the  
system’s single connector attachment (SCA) position on the  
system’s back panel.  
 
Cheetah 4LP Installation Guide, Rev. B  
21  
SCSI ID jumpers  
Each device on the SCSI chain must have a unique SCSI ID.  
The host system’s SCSI controller usually uses the ID that has  
the highest priority interrupt in the SCSI I/O system. This is  
always ID7. ID0 is lowest priority in an 8-bit I/O system. ID8 is  
lowest priority in a 16-bit I/O system. The lower priority SCSI IDs  
are normally used for other SCSI devices such as this Cheetah  
disc drive.  
Note. Most SCSI controllers (host adapters) allow you to skip a  
SCSI ID. For example, you can have ID0, ID1, and ID3  
(skipping ID2). Other controllers do not allow this so be  
sure to refer to your system or controller user’s manual  
for details about its requirements for proper SCSI device  
installation.  
Note. This drive is a SCAM (SCSI Configured Auto Magically)  
compliant drive. If the system into which you are installing  
this drive requires SCAM compliant drives, you do not  
need to be concerned about the drive ID jumper settings,  
as the system automatically assigns your new drive the  
ID it wants it to have. The system may or may not use the  
existing drive ID jumper settings. Setting the drive ID  
doesn’t hurt anything, but is not necessary in a SCAM  
compliant system.  
Most Cheetah disc drives are factory set with the SCSI ID set at  
0. To change the SCSI ID, refer to the appropriate drive section  
for your model.  
If, after completing the installation process, the drive’s LED does  
not show on/off activity when the host is trying to communicate  
with the drive, a duplicate SCSI ID may be the problem. If this is  
22  
Cheetah 4LP Installation Guide, Rev. B  
the case, change the ID so that each device on the SCSI chain  
has its own unique ID. Also check your system or controller  
user’s manual to ensure that you have not violated its SCSI ID  
numbering recommendations.  
Drive termination  
If you are installing a Cheetah drive in a system that has other  
SCSI devices installed, terminate only the end devices on the  
SCSI chain. A SCSI “device” is any disc drive, scanner, tape  
backup unit, or other piece of hardware connected to your sys-  
tem using the SCSI bus.  
The top example in Figure 2 shows an internal hard disc at one  
end of the SCSI bus with the SCSI controller at the other end  
(both are terminated). The bottom example shows two additional  
SCSI devices connected externally—this means the SCSI con-  
troller is no longer on the end of the SCSI chain and should not  
be terminated.  
Note. Some controllers prefer to remain terminated even if they  
are in the middle of the chain. Also, some controllers treat  
the internal and external chains as separate logical  
buses. This means you may need to terminate both the  
first and last devices on both logical buses to achieve  
proper termination. If necessary, refer to your system or  
controller documentation to see how this is handled in  
your particular system.  
For information about how to terminate your drive, refer to the  
appropriate drive-specific section.  
Cheetah 4LP Installation Guide, Rev. B  
23  
Internal SCSI cable  
Internal  
Internal  
Controller  
SCSI device SCSI device  
Terminate  
Internal SCSI cable  
External  
SCSI  
cable  
Internal  
Internal  
SCSI device SCSI device  
External  
External  
Controller  
SCSI device SCSI device  
Terminate  
Figure 2. SCSI bus termination  
Terminator power  
You usually will not need to change this option and can normally  
leave the drive configured as it was shipped from the factory. For  
information about how to change the terminator power option on  
your drive, refer to the appropriate drive-specific section.  
I/O circuits and data path widths  
• “WD” and “DC” models use differential I/O circuits. You cannot  
mix these models with single-ended models (“N,” “W,” “WC”)  
on the same SCSI bus. The circuits are incompatible with  
each other.  
• “W,” “WD,” and “WC” models have a “wide” (16-bit) SCSI data  
bus rather than the standard (non-wide) 8-bit SCSI data bus;  
however, you can use these wide drives on a standard (non-  
wide) 8-bit data bus.  
 
24  
Cheetah 4LP Installation Guide, Rev. B  
Figures 3a, 3b, 3c, and 3d show typical drive connections. The  
following table lists the maximum cable lengths and number of  
devices with single-ended I/O circuits allowed on a daisy-chain  
cable for 5 and 20 Mbytes/sec I/O data transfer rates.  
Table 4.  
Cable characteristics for single-ended circuits  
I/O transfer  
rate  
Maximum number of  
devices on line  
Maximum cable  
length allowed  
5 Mbytes/s  
5 Mbytes/s  
20 Mbytes/s  
20 Mbytes/s  
20 Mbytes/s  
8 (reg. SCSI bus)  
16 (wide SCSI bus)  
4 (reg. SCSI bus)  
8 (reg. SCSI bus)  
(wide SCSI bus)1  
6 meters (19.7 ft.)  
6 meters (19.7 ft.)  
3 meters (9.8 ft.)  
1.5 meters (4.9 ft.)  
1
1See system documentation. ANSI spec does not specify a  
value here.  
For devices having differential I/O circuits, a maximum cable  
length of 25 meters (82 feet) is allowed. A maximum of 8 devices  
can be connected on an 8-bit wide data bus, and a maximum of  
16 devices can be connected on a 16-bit wide data bus.  
   
Cheetah 4LP Installation Guide, Rev. B  
25  
Figure 3a. 50-pin I/O connection to drive  
Figure 3b. 68-pin I/O connection to drive  
   
26  
Cheetah 4LP Installation Guide, Rev. B  
“N” Model  
Drive  
2 through X SCSI devices [1]  
Pin 1  
(check your  
adapter for Pin 1 location)  
SCSI ID 1  
SCSI ID 7  
[2]  
Host Adapter  
PCB  
SCSI ID 0  
[1] “X” means up to 6 or the maximum allowable number of devices on  
the SCSI bus. See system documentation.  
Figure 3c. Multiple drive connection to host adapter  
 
Cheetah 4LP Installation Guide, Rev. B  
27  
“W” Model  
Drive  
“WD” Model  
Drive  
Note:  
Do not mix  
“W” and “WD”  
model drives  
on the daisy  
chain.  
[2]  
2 through X  
SCSI devices [1]  
Terminator  
Pin 1  
SCSI ID 1  
(check your  
adapter for Pin 1 location)  
SCSI ID 7  
Host Adapter  
PCB  
SCSI ID 0  
[1] “X” means up to 15 or the maximum allowable number of devices on  
the SCSI bus. See system documentation and Table 4.  
[2] External terminator. Used only on end “WD” drive.  
Figure 3d. Multiple-drive connection to host adapter  
 
28  
Cheetah 4LP Installation Guide, Rev. B  
80-pin  
SCSI I/O  
Connector  
Pin 1  
J2  
J6  
Note. This drive model plugs directly into a backplane connec-  
tor and therefore uses no cables.  
Figure 3e. Drive model “WC” or “DC” with single 80-pin I/O  
and power connector  
Cheetah 4LP Installation Guide, Rev. B  
29  
Providing adequate cooling  
The enclosure design must ensure adequate cooling for the  
drive. The maximum ambient temperature is 50°C.  
The drive’s product manual (83329120) describes how to evalu-  
ate the air-flow design. The evaluation consists of ensuring that  
the case temperature of certain critical components remains  
within acceptable limits during drive operation.  
We recommend orienting the drive or directing the air flow in a  
way that creates the least amount of air-flow resistance while  
providing air flow above the circuit boards and around the head  
and disc assembly (HDA). Also, choose the shortest possible  
path between the air inlet and exit. This minimizes the distance  
traveled by air that is heated by the drive and by other nearby  
heat sources.  
Figure 4 shows two design approaches with one or more fans  
used to generate air flow. The air-flow patterns can be created  
by the fans either pushing or drawing air. The overall flow pattern  
can be directed from front to back, back to front, or side to side.  
30  
Cheetah 4LP Installation Guide, Rev. B  
Kühlung des Systems  
Die Gehäusekonstruktion muß eine ausreichende Kühlung des  
Laufwerkes gewährleisten. Die Umgebungstemperatur darf  
maximal 50°C betragen.  
Die Produkthandbuch Cheetah 4LP (Dokument 83329120)  
enthalten Anweisungen zur Beurteilung der Luftstromkonstruk-  
tion. Die Beurteilung muß sicherstellen, daß sich die Gehäuse-  
temperatur bestimmter kritischer Komponenten bei  
Laufwerkbetrieb innerhalb zugelassener Grenzen hält.  
Wir empfehlen, das Laufwerk so zu orientieren oder den Luft-  
strom so zu lenken, daß der geringste Luftstromwiderstand  
erzeugt wird und gleichzeitig ein Luftstrom über den Platinen  
und um die Kopf- und Festplatteneinheit (HDA) gegeben ist.  
Wählen Sie einen möglichst kurzen Weg zwischen Lufteinlaß  
und -auslaß. Dadurch wird die Strecke, die die vom Laufwerk  
und anderen nahegelegenen Hitzequellen aufgewärmte Luft  
zurücklegt, auf ein Minimum beschränkt.  
Abbildung 4 zeigt zwei Konstruktionsmöglichkeiten, bei denen  
ein oder mehrere Lüfter den Luftstrom erzeugen. Der Luftstrom-  
verlauf wird durch die Lüfter gesteuert, die entweder Luft einbla-  
sen oder abziehen. Generell kann der Luftstrom entweder von  
vorne nach hinten oder von hinten nach vorne verlaufen.  
 
Cheetah 4LP Installation Guide, Rev. B  
31  
.
Above unit  
Under unit  
Note. Air flows in the direction shown (back to front)  
or in reverse direction (front to back)  
Above unit  
Under unit  
Note. Air flows in the direction shown or  
in reverse direction (side to side)  
Figure 4. Suggested air flow  
Abbildung 4. Empfohlener Luftstromverlauf  
 
32  
Cheetah 4LP Installation Guide, Rev. B  
Mounting the drive and connecting cables  
Do not touch the connector pins or any components on the con-  
trol board without observing static-discharge precautions.  
Always handle the drive by the frame only.  
The drive may be mounted in any orientation (horizontally, verti-  
cally, and any combination thereof); however, you must ensure  
that the drive receives adequate air flow for cooling.  
1. Mount the drive to the host system’s chassis using four 6-32  
UNC screws. Two mounting holes are in each side of the  
drive and there are four mounting holes in the bottom of the  
drive.  
The maximum length that the screws should extend into the  
chassis mounting holes is 0.15 inch (3.81 mm), measured  
from the outer surface of the chassis. Tighten the screws  
down evenly. Do not over-tighten or force the screw if it  
does not seem to screw in easily, because this means the  
threads are not properly aligned. In this case, back the  
screw out and try again.  
Installation des Laufwerkes  
und Anschluß der Kabel  
Beachten Sie beim Handhaben und Anfassen der Anschlußstifte  
und Komponenten die Vorsichtsmaßnahmen zur Verhinderung  
statischer Aufladung. Fassen Sie das Laufwerk nur am Rahmen  
an.  
Das Laufwerk kann in beliebiger Orientierung (horizontal, ver-  
tikal oder schräg) installiert werden; jedoch muß dafür gesorgt  
werden, daß ein ausreichender Luftstrom zur Kühlung des Lauf-  
werkes vorhanden ist.  
 
Cheetah 4LP Installation Guide, Rev. B  
33  
1. Befestigen Sie das Laufwerk mit vier 6-32-UNC-Schrauben  
am Gehäuse des Host-Systems. Die beiden Seiten des  
Laufwerkes sind mit jeweils zwei Befestigungslöchern  
versehen, die Unterseite des Laufwerkes weist vier weitere  
Befestigungslöcher auf.  
Gemessen von der Außenfläche des Gehäuses dürfen die  
Schrauben maximal 3,81 mm in die Befestigungslöcher des  
Gehüuses hineinragen. Die Schrauben müssen gleich-  
mäßig, jedoch nicht zu fest, angezogen werden. Wenn sich  
eine Schraube nicht ohne Widerstand einschrauben läßt,  
sind die Gewinde nicht korrekt aneinander ausgerichtet. In  
diesem Fall die Schraube nicht in das Gewindeloch  
forcieren, sondern die Schraube herausnehmen und erneut  
in das Gewindeloch einführen.  
2. Verify that all connections between the drive and the host  
system are correctly installed.  
2. Prüfen Sie, ob alle Verbindungen zwischen dem Laufwerk  
und dem Host-System korrekt hergestellt sind.  
3. Verify that you have correctly installed jumpers.  
3. Stellen Sie sicher, daß die Kennungsbrücken installiert sind.  
4. Connect the SCSI cable into the drive’s SCSI connector.  
Take care not to stretch or crimp this cable, and do not  
block the system’s cooling air flow with the cable.  
The drive receives DC power through a 4-pin connector  
mounted next to the SCSI connector. The output of a power  
supply must meet SELV (safety extra low voltage) as  
34  
Cheetah 4LP Installation Guide, Rev. B  
defined in IEC 950. Figure 5 provides the pin information for  
the DC power connector. To connect the DC power cable to  
the drive, simply insert the cable end into the drive’s DC  
power connector.  
4. Schließen Sie das SCSI-Kabel an den SCSI-Steckverbinder  
des Laufwerkes an. Das Kabel darf nicht gedehnt oder  
gedrückt werden und es darf den Luftstrom zur Kühlung des  
Systems nicht behindern.  
Das Laufwerk wird über einen 4-poligen, neben dem SCSI-  
Anschluß befestigten Steckverbinder mit Gleichstrom ver-  
sorgt. Der Ausgang eines Netzteils muß SELV (safety extra  
low voltage) nach IEC 950 entsprechen. Abbildung 5 zeigt  
die Steckerbelegung für den Gleichstromanschluß. Zum  
Anschluß des Gleichstromkabels an das Laufwerk das  
Kabelende in den Gleichstromanschluß des Laufwerkes  
stecken.  
Pin  
1
Power  
Pin Gleichstrom  
+12V  
1
2
3
4
+12 V  
2
+12V return  
+ 5V return  
+ 5V  
+12 V Rückleitung  
+ 5 V Rückleitung  
+ 5 V  
3
4
4
3
2
1
Figure 5. DC power connector  
Abbildung 5. Gleichstromanschluß  
 
Cheetah 4LP Installation Guide, Rev. B  
35  
Note. Signal ground on the power control board (PCB) and the  
head and disc assembly (HDA) are connected together in  
this drive and you cannot separate them. The equipment  
in which you have mounted the drive is connected  
directly to the HDA and PCB without electrically isolating  
shock mounts. Maximizing the conductive contact area  
between HDA ground and system ground may reduce  
radiated emissions.  
If you do not want the system chassis to be connected to  
the HDA/PCB ground, you must provide a nonconductive  
(electrically isolating) method of mounting the drive in the  
host system. This may increase radiated emissions and  
is the system designer’s responsibility.  
Hinweis.  
Die Signalerde auf der Stromregelungskarte (PCB) und  
der Kopf- und Festplatteneinheit (HDA) sind in diesem  
Laufwerk miteinander verbunden und können nicht  
getrennt werden. Das Gerät, in das Sie das Laufwerk  
eingebaut haben, ist ohne elektrisch isolierende  
Stoßdämpfer direkt an die HDA und PCB angeschlossen.  
Die elektromagnetische Strahlung kann reduziert wer-  
den, indem Sie eine möglichst große leitende Kontak-  
fläche zwischen der HDA-Erdung und der Systemerdung  
vorsehen.  
Wenn Sie das Systemgehäuse nicht an die HDA/PCB-  
Erdung anschließen wollen, müssen Sie das Laufwerk  
auf nichtleitende Weise (galvanisch isoliert) im Host-Sys-  
tem einbauen. Die daraus u.U. resultierende verstärkte  
36  
Cheetah 4LP Installation Guide, Rev. B  
elektromagnetische Strahlung fällt in den Zuständigkeits-  
bereich des Systemdesigners.  
5. Replace the host system’s cover.  
5. Setzen Sie das Gehäuseoberteil des Host-Systems wieder  
auf.  
Cheetah 4LP Installation Guide, Rev. B  
37  
[1]  
A
[3]  
L
C
F
D
G
E
Notes:  
.050 in. (1.27mm)  
minimum clearance  
[1] Mounting holes three on each side, 6-32 UNC.  
Max screw length into side of drive 0.15 in.  
(3.81 mm). Screw tightening torque 6.0 in-lb  
(.675 NM) max with minimum thread  
engagement of 0.12 in. (3.05 mm).  
B
[2] Mounting holes four on bottom, 6-32 UNC.  
Max screw length into bottom of drive 0.15 in.  
(3.81 mm). Screw tightening torque 6.0 in-lb  
(.675 NM) max with minimum thread  
engagement of 0.12 in. (3.05 mm).  
[2]  
K
[3] Power and interface connectors can extend  
past the “A” dimension by 0.040 in (1.02mm).  
[4] Decorative front panel.  
J2  
Inches  
Millimeters  
A
B
C
5.750  
4.000  
1.000  
±
±
+
0.010 146.05 ± .25  
0.010 101.60 ± .25  
0.026  
0.010  
0.020  
25.40 ± .38  
D
E
F
G
H
J
K
L
M
0.625  
4.000  
0.250  
2.375  
3.750  
2.370  
1.750  
1.100  
4.100  
±
±
±
±
±
±
±
±
±
15.87 ± .50  
0.005 101.60 ± .13  
J
0.005  
0.010  
0.010  
0.010  
0.020  
0.010  
6.35 ± .13  
60.32 ± .25  
95.25 ± .25  
60.20 ± .25  
44.45 ± .50  
27.94 ± .25  
J6  
LED  
M
H
[4]  
0.010 104.14 ± .25  
Figure 6. Mounting configuration dimensions  
38  
Cheetah 4LP Installation Guide, Rev. B  
Formatting the drive  
Warning. Formatting a drive erases all user data. Be sure that  
you understand this principle before formatting any  
hard disc drive. It is not necessary to format a drive  
that previously has been used to store data, unless  
your intention is to erase all user data.  
Note. Seagate is not responsible for lost user data.  
1. Turn on DC power.  
2. Boot the system from a system floppy disc or from a previ-  
ously installed hard disc drive if there is one.  
3. Format the disc drive. Cheetah 4LP disc drives are  
designed to operate with a variety of operating systems.  
Please refer to your system or SCSI controller manual for  
information about formatting and setting up the drive. Some  
quick desktop system notes are provided below.  
Quick reference desktop system notes  
Note. Refer to your system or utility manual for detailed instruc-  
tions)  
• DOS. Set the drive type in CMOS to “Zero,” “None,” or “No  
hard drive installed.” Use FDISK.EXE and FORMAT.EXE. Sys-  
tems that have operating system Windows 95 release 950B or  
later do not need to partition the drive.  
• Macintosh. Use a third-party drive utility (Apple’s HD Setup  
utility only works with drives having special Apple firmware).  
Cheetah 4LP Installation Guide, Rev. B  
39  
N drives  
Setting the SCSI IDNjudmrivpeesrssectionb  
Use the J6 connector to set the SCSI ID (see Figure 7). To  
change the SCSI ID, install jumpers on the appropriate pins as  
shown in the illustration.  
J2  
Jumper Plug  
(enlarged to  
show detail)  
Pin 1  
End  
J6  
J6 [4]  
Pin 1  
SCSI ID = 0 (default)  
SCSI ID = 1  
SCSI ID = 2  
SCSI ID = 3  
SCSI ID = 4  
SCSI ID = 5  
SCSI ID = 6  
SCSI ID = 7  
Figure 7. Setting the SCSI ID on model “N” drives  
   
40  
Cheetah 4LP Installation Guide, Rev. B  
N drives  
Terminating the drive  
“N” model drives are terminated with permanently mounted IC  
active terminators. If you install one of these drives and it is not  
on the end of the SCSI bus, disable the terminators by removing  
the jumper “TE” from pins 15 and 16 of connector J2 (see Fig-  
ure 8). If you install the drive on the end of the SCSI bus, enable  
termination by installing a jumper on pins 15 and 16 of connector  
J2.  
Pin 1  
J2  
Pin 2  
R T T  
T D MW P E P P  
E S E P D S 2 1  
Enable Terminator (default)  
Disable Terminator  
Pin 1  
J2  
J6  
SCSI I/O  
Connector  
J1  
J2 Jumper  
(enlarged to  
show detail)  
Drive  
Front  
DC Power  
Connector  
Figure 8. Terminating the drive  
 
Cheetah 4LP Installation Guide, Rev. B  
41  
N drives  
Terminator power  
There are three possible terminator power (TP) configurations  
for “N” model drives (see Figure 9). You will not normally need to  
change this option and can leave the drive configured as it was  
shipped from the factory.  
Pin 1  
J2  
Pin 2  
R T T  
T D MW P E P P  
E S E P D S 2 1  
Term. Power from Drive (default)  
Term. Power to SCSI Bus  
Term. Power from SCSI Bus (position A)  
Term. Power to SCSI Bus and Drive  
Pin 1  
J2  
J6  
SCSI I/O  
Connector  
J1  
J2 Jumper  
(enlarged to  
show detail)  
Drive  
Front  
DC Power  
Connector  
Figure 9. Setting terminator power jumpers  
 
42  
Cheetah 4LP Installation Guide, Rev. B  
N drives  
Other applicable jumper options  
Several other jumper options are available as illustrated.  
Pin 1  
Pin 2  
J2  
R T  
T
T D MW P E P P  
E S E P D S 2  
1
Reserved  
Delay Motor Start option  
(valid only if the Enable Motor Start jumper is not connected)  
Disable the Delay Motor Start option (default).  
Motor start delay equal to the SCSI ID multiplied by 12 seconds.  
For example, if the SCSI ID = 2, the drive starts in 24 seconds.  
Motor Start option  
Disable motor start (default). The drive starts according to the  
Delay Motor Start option.  
Enable motor start. The drive waits for the Start Unit command  
from the host before starting the spindle motor.  
Write Protect option  
Write protect = Off (enables writing – default).  
Write protect = On (disables writing).  
Parity Check option  
Enable parity check of SCSI bus (default).  
Disable parity check.  
Pin 1  
J2  
J6  
SCSI I/O  
Connector  
J1  
Drive  
Front  
J2 Jumper  
(enlarged to  
show detail)  
DC Power  
Connector  
Figure 10. Additional jumper options  
Cheetah 4LP Installation Guide, Rev. B  
43  
W/WD drives  
Setting the SCSIWID/WjuDmdpreirvses section  
Use the J6 jumper block to set the SCSI ID (Figure 11). To  
change the SCSI ID, install jumpers on the appropriate pins as  
shown in the illustration. Optional connections to switching cir-  
cuits in host equipment are provided on J1 auxiliary to set the  
SCSI ID (see Figure 12).  
J2  
Jumper Plug  
(enlarged to  
show detail)  
Pin 1  
End  
J6  
Pin 1  
J6 [1]  
SCSI ID = 0 (default)  
SCSI ID = 1  
SCSI ID = 2  
Note:  
SCSI ID = 3  
SCSI ID = 4  
SCSI ID = 5  
SCSI ID = 6  
SCSI ID = 7  
SCSI ID = 8  
SCSI ID = 9  
SCSI ID = 10  
SCSI ID = 11  
SCSI ID = 12  
SCSI ID = 13  
SCSI ID = 14  
SCSI ID = 15  
[1] Do not remove  
cover from pins  
13 through 20  
(darkened area).  
Figure 11. Setting the SCSI ID on model “W” and “WD”  
drives  
   
44  
W/WD drives  
Cheetah 4LP Installation Guide, Rev. B  
68 Pin  
SCSI I/O Connector  
J1  
Pin 1  
J1A [2][4]  
Pin 1  
4P  
3P 2P  
1P  
J1-DC Power  
Pin 12  
SCSI ID = 0  
SCSI ID = 1  
SCSI ID = 2  
SCSI ID = 3  
SCSI ID = 4  
SCSI ID = 5  
SCSI ID = 6  
SCSI ID = 7  
SCSI ID = 8  
SCSI ID = 9  
SCSI ID = 10  
SCSI ID = 11  
SCSI ID = 12  
SCSI ID = 13  
SCSI ID = 14  
SCSI ID = 15  
J1A Pin 1  
SCSI Address A0  
SCSI Address A1  
SCSI Address A2  
SCSI Address A3  
No connection  
+5V  
Fault LED*  
Vendor Unique*  
Reserved  
Activity LED*  
Ground*  
* These pins are driven low for  
250 ms after PWR ON or  
RESET to allow jumper  
selectable SCSI ID as shown  
to the right.  
Figure 12. Model “W” and “WD” drive alternate ID select  
and LED connection  
 
Cheetah 4LP Installation Guide, Rev. B  
45  
W/WD drives  
Terminating the drive  
“W” model drives are terminated with permanently mounted IC  
active terminators. If you install one of these drives and it is not  
on the end of the SCSI bus, disable the terminators by removing  
the jumper “TE” from pins 15 and 16 of connector J2. If you  
install the drive on the end of the SCSI bus, enable termination  
by installing a jumper on pins 15 and 16 of connector J2 (see  
Figure 13).  
Note. Use active (ANSI SCSI-2 Alternative 2) terminators when  
terminating the bus.  
“WD” model drives do not have internal terminators or any other  
way of adding internal termination to the drive. You must provide  
external differential termination to these drives when termination  
is required. See Figure 3d.  
Pin 1  
J2  
Pin 2  
R T T  
T D MW P E P P  
E S E P D S 2 1  
Enable Terminator (default)  
Disable Terminator  
Pin 1  
J2  
J6  
SCSI I/O  
Connector  
J1  
J2 Jumper  
(enlarged to  
show detail)  
Drive  
Front  
DC Power  
Connector  
Figure 13. Terminating the drive (“W” model shown)  
 
46  
W/WD drives  
Terminator power  
Cheetah 4LP Installation Guide, Rev. B  
There are three possible terminator power (TP) configurations  
for “W” model drives (see Figure 14). You will not normally need  
to change this option and can leave the drive configured as it  
was shipped from the factory.  
There are two possible terminator power (TP) configurations for  
“WD” model drives (see Figure 14).  
Pin 1  
J2  
Pin 2  
R T T  
T D MW P E P P  
E S E P D S 2 1  
“W” Models  
Term. Power from Drive (default)  
Term. Power to SCSI Bus  
Term. Power from SCSI Bus (position A)  
Term. Power to SCSI Bus and Drive  
“WD” Models  
Term. Power to SCSI Bus (default)  
Host adapter or other device provides  
term. power to external terminator.  
Pin 1  
J2  
J6  
SCSI I/O  
Connector  
J1  
Drive  
Front  
J2 Jumper  
(enlarged to  
show detail)  
DC Power  
Connector  
Figure 14. Setting terminator power jumpers  
 
Cheetah 4LP Installation Guide, Rev. B  
47  
W/WD drives  
Other applicable jumper options  
Other option jumpers are available as illustrated below.  
Pin 1  
Pin 2  
J2  
R T  
T D MW P E P P  
E S E P D S 2  
T
1
Reserved  
Delay Motor Start option  
(valid only if the Enable Motor Start jumper is not connected)  
Disable the Delay Motor Start option (default).  
Motor start delay equal to the SCSI ID multiplied by 12 seconds.  
For example, if the SCSI ID = 2, the drive starts in 24 seconds.  
Motor Start option  
Disable motor start (default). The drive starts according to the  
Delay Motor Start option.  
Enable motor start. The drive waits for the Start Unit command  
from the host before starting the spindle motor.  
Write Protect option  
Write protect = Off (enables writing – default).  
Write protect = On (disables writing).  
Parity Check option  
Enable parity check of SCSI bus (default).  
Disable parity check.  
Pin 1  
J2  
J6  
SCSI I/O  
Connector  
J1  
Drive  
Front  
J2 Jumper  
(enlarged to  
show detail)  
DC Power  
Connector  
Figure 15. Additional jumper options  
48  
Cheetah 4LP Installation Guide, Rev. B  
WC/DC drives  
Setting the SCSIWIDC/jDumCpderirvses section  
The SCSI ID for “WC” and “DC” model drives is normally set  
over the SCSI bus by the host system using connector contacts  
39 (ID0), 40 (ID2), 79 (ID1), and 80 (ID3).  
Terminating the drive  
“WC” and “DC” model drives do not have internal terminators or  
any other way of adding internal termination to the drive. You  
must provide external termination to these drives when termina-  
tion is required.  
 
Cheetah 4LP Installation Guide, Rev. B  
49  
WC/DC drives  
Applicable jumper options  
Option jumpers are available as illustrated below.  
Pin 1  
J2  
R
RRR  
EDMWPEE E  
S S EP DSS S  
Delay Motor Start option  
The host system has complete  
control over motor start functions. Do  
not install a jumper on these pins.  
Enable Motor Start option  
The host system has complete  
control over motor start functions. Do  
not install a jumper on these pins.  
Write Protect option  
Write protect = Off  
(enables writing – default)  
Write protect = On  
(disables writing)  
Parity Check option  
Enable parity check of SCSI bus  
(default).  
Disable parity check.  
J2  
J6  
SCSI I/O  
Connector  
J1  
Drive  
Front  
J2 Jumper Type  
(enlarged to  
show detail)  
DC Power  
Connector  
Figure 16. Jumper options  
50  
Cheetah 4LP Installation Guide, Rev. B  
All drives  
Drive Active Ainldl dicraivtoers (LED connections)  
The drive Active LED indicator connections are shown below.  
J2  
Jumper Plug  
(enlarged to  
show detail)  
Pin 1  
J6  
End  
Pin 1  
J6  
Reserved  
Activity LED  
Reserved  
CATH  
The shaded pins are shipped  
with a cover installed. Do not  
install jumpers on these pins.  
Retain the cover unless you  
install a 20-pin plug.  
Note: On some LEDs the flat  
side of indicator is cathode.  
Figure 17. Drive Active LED indicator connections  
 
Seagate Technology, Inc.  
920 Disc Drive, Scotts Valley, CA 95066-4544, USA  
Publication Number: 83329110, Rev. B, Printed in USA  

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