Seagate CHEETAH 18FC User Manual

Cheetah 18FC  
Fibre Channel  
Disc Drive  
ST118202FC  
Installation Guide  
Cheetah 18FC Installation Guide, Rev. A  
1
Preface  
This manual contains information for users of Seagate Cheetah  
18FC (Fibre Channel interface) disc drives. It provides technical  
support information, performance specifications, installation  
instructions, and a troubleshooting section. Additional informa-  
tion is available in the Cheetah 18FC Product Manual (part num-  
ber 83329330). Contact your Seagate sales representative if you  
need to order this publication.  
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 semi-  
conductors 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 gen-  
eral rule, remember that you and the drive electronics must  
   
2
Cheetah 18FC Installation Guide, Rev. A  
all be grounded to avoid potentially damaging static dis-  
charges.  
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  
static electricity from the carrier or tray prior to inserting it  
into the system.  
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-  
 
Cheetah 18FC Installation Guide, Rev. A  
peratures are usually highest.  
3
• Follow the precautions listed above in “Electrostatic discharge  
protection.”  
• Do not remove any circuit boards from the drive chassis.  
Return the entire drive for depot repair if any circuit board is  
defective. Removal of circuit boards by personnel not perform-  
ing depot repair will damage components and may void the  
warranty.  
• Do not remove the head and disc assembly (HDA) from the  
drive. 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 war-  
ranty.  
As a component, the drive is designed to be installed and oper-  
ated in accordance with UL1950, EN60950, CAN/CSA C22.2  
950-95, VDE0805 and IEC950.  
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 Barracuda 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 overcurrent protection on drive SELV supply voltages.  
4
Cheetah 18FC Installation Guide, Rev. A  
This unit is a component part and as such is not meant to com-  
ply 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.  
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.  
 
Cheetah 18FC Installation Guide, Rev. A  
5
Beachten Sie in jedem Fall die folgenden Warn-und Vorsicht-  
shinweise:  
• Beachten Sie alle Warn- und Vorsichtshinweise in diesem  
Handbuch.  
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 Entfernungsar-  
beiten 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 Laufwerk nehmen! Falls die HDA beschädigt ist, schicken  
Sie das gesamte Laufwerk zur Reparatur ein.  
6
Cheetah 18FC Installation Guide, Rev. A  
• 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-  
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,  
CAN\CSA C22.2 950-95 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. Sicherheitsbe-  
hörden gewähren eine bedingte Zulassung für Komponenten wie  
das Cheetah-Festplattenlaufwerk vorbehaltlich der endgültigen  
Zulasssung im Endprodukt. Designer von Untersystemen sind  
dafür verantwortlich, die Voraussetzungen für die Einhaltung  
sicherheits- oder aufsichtsbehördlicher Vorschriften in ihren End-  
produkten und - falls gesetzlich vorgeschrieben - für die Zulas-  
sung zu schaffen. Eine Grundvoraussetzung zur Einhaltung der  
Sicherheitsanforderungen ist die Bereitstellung eines Überlasts-  
chutzes 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 elektro-  
magnetische Strahlung sind für Designer von Untersystemen auf  
Anfrage von der Seagate-Sicherheitsabteilung erhältlich.  
Cheetah 18FC Installation Guide, Rev. A  
7
European Union Compliance  
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).  
Seagate uses an independent laboratory to confirm compliance  
to the above directives. The drive was tested in a representative  
system for typical applications. The selected system represents  
the most popular characteristics for test platforms. The system  
configurations include:  
• 486, Pentium, and PowerPC Microprocessors  
• 3.5-inch Floppy Disc Drive  
• Keyboard  
• Monitor/Display  
• Mouse  
• Printer  
Although the test system with this Seagate model complies to  
the directives, we cannot guarantee that all systems will comply.  
The computer manufacturer or system integrator shall confirm  
EMC compliance and provide CE Marking for their product.  
 
8
Cheetah 18FC Installation Guide, Rev. A  
Seagate Technology support services  
Presales support  
To determine which Seagate products are best suited for your  
specific application, contact us about configuration and compati-  
bility and for current product availability. You can leave a voice  
message after business hours or send an e-mail message—we  
reply during business hours.  
Disc Drives 405-936-1210 Fax: 405-936-1683  
A.M.  
P M  
P M  
P.M.  
(8:00  
to 12:15 . ., 1:30 . . to 6:00 , central time, M-F)  
Tape Products 1-800-626-6637 or 714-641-2500  
A.M. P.M.,  
pacific time, M-F)  
Fax: 714-641-2410 (6:00  
to 5:00  
Note. You can purchase select tape products and tape acces-  
sories through Seagate Express 24 hours daily by calling  
1-800-531-0968 or by faxing your order to 972-481-4812.  
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 support ser-  
vices 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  
 
Cheetah 18FC Installation Guide, Rev. A  
9
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 405-936-1234.  
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)  
ftp.seagate.com)  
to  
(ftp://  
or Seagate’s ftp server  
. You can also send E-mail with your questions  
DiscSupport @ Seagate.com TapeSupport @  
or  
Seagate.com  
.
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  
France  
Germany  
Taiwan  
Phone number  
61-2-9756-2359  
33 1-48 25 35 95  
49-89-140-9331  
886-2-2719-6075  
662-531-8111  
Thailand  
10  
Cheetah 18FC Installation Guide, Rev. A  
Phone number  
Location  
UK  
44-1628-478011  
USA  
Disc: 405-936-1600; Tape: 405-936-1630  
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  
Germany  
UK  
Phone number  
61-2-9756-5170  
49-89-1430-5102  
44-1628-894084  
USA  
Disc: 405-936-1620; Tape: 405-936-1640  
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  
France  
Phone number  
61-2-9725-4052  
33 1-46 04 42 50  
49-89-1430-5100  
Germany  
Hong Kong 852-2368 7173  
Japan  
Korea  
Singapore  
Taiwan  
81-3-5462-2979  
82-2-556-4251/7395  
65-488-7528  
886-2-2715-2923  
Cheetah 18FC Installation Guide, Rev. A  
11  
Location  
UK  
Phone number  
44-1628-890660  
USA  
Disc: 405-936-1685; Tape: 405-936-1683  
Direct-support services  
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  
Phone number  
A.M.  
P.M.  
Australia  
61-2-9725-3366 (9:00  
time, M–F)  
to 5:00  
, eastern  
A.M.  
P.M.  
France  
33 1-41 86 10 86 (9:30  
to 12:30  
,
P.M.  
P.M.  
2:00  
to 5:00  
, M–F)  
Germany  
Disc: 49-89-140-9332; Tape: 49-89-140-9333  
A.M.  
P.M.  
P.M.  
P.M.  
to 4:00 ,  
(9:30  
M–F)  
to 12:30  
, 2:00  
Hong Kong 852-2368 9918  
A.M.  
P.M.  
, 1:00  
Korea  
82-2-531-5800 (9:00  
P.M. P.M.  
to 12:00  
to 6:00  
65-488-7584 (9:00  
P.M.  
, M–F)  
A.M.  
P.M.  
to 12:00 , 2:00  
P.M.  
Singapore  
to 5:00  
886-2-2514-2237  
44-1628-894083 (10:00  
, M–F)  
Taiwan  
UK  
A.M.  
P.M.  
,
to 1:00  
P.M.  
P.M.  
, M–F)  
2:00  
to 5:00  
USA  
Please dial 1-800-SEAGATE or 405-936-1234  
for the specific product telephone number.  
A.M.  
P.M.  
P.M.  
P.M.  
to 6:00 ,  
(8:00  
central time, M–F)  
to 12:15  
, 1:30  
12  
Cheetah 18FC Installation Guide, Rev. A  
SeaTDD™ 405-936-1687  
Using a telecommunications device for the deaf (TDD), you can  
send questions or comments 24 hours daily and exchange mes-  
A.M.  
sages with a technical support specialist between 8:00  
to  
P.M.  
12:15 P.M. and 1:30 P.M. to 6:00  
through Friday.  
(central time) Monday  
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  
65-488-7503  
Europe, Middle East,  
and Africa  
31-2031-67300  
31-2065-34320  
Japan  
USA  
81-3-5462-2904 81-3-5462-2979  
1-800-468-3472 405-949-6740  
Other Americas (Brazil,  
Canada, Mexico)  
405-949-6706  
405-949-6738  
Manufacturer’s representatives  
Brazil  
MA Informatica  
55-21-516-6649 55-21-516-5280  
Canada  
Memofix  
Adtech  
905-660-4936  
905-812-8099  
1-800-624-9857  
905-660-8738  
905-812-7807  
Cheetah 18FC Installation Guide, Rev. A  
13  
Location  
Phone number  
FAX number  
Mexico  
Abicom Seamax  
SA DE CV  
Southern Europe  
Caesar Italia  
525-546-4888  
39-688-18149  
525-546-4888  
39-688-02103  
14  
Cheetah 18FC Installation Guide, Rev. A  
General description  
Cheetah 18FC disc drives are high-speed, random-access digi-  
tal-data storage devices designed to be used within a Fibre  
Channel host system.  
The drive is a component for installation in an enclosure  
designed for the drive. The disc drive must receive adequate  
cooling (refer to “Providing adequate cooling”) and it must be  
sufficiently grounded and shielded from emissions. The Cheetah  
18FC Product Manual (part number 83329330) contains guide-  
lines for a properly designed enclosure.  
Figure 1:  
Cheetah 18FC disc drive  
 
Cheetah 18FC Installation Guide, Rev. A  
15  
Characteristics  
ST118202FC  
Interface  
Fibre Channel  
Capacity  
Unformatted (Gbytes)  
Formatted (Gbytes)1  
22.54  
18.2  
Recording  
Cylinders (user)  
Read/write data heads  
Avg bytes/track  
6,962  
24  
104,840 to 159,008  
Access time  
Average read (msec)  
Average write (msec)  
5.9  
6.7  
Disc rotation  
RPM  
10,025  
2.99  
Average latency (msec)  
Data transfer rate  
Maximum instantaneous  
(Mbytes/sec per port)  
106.3  
1. The specified formatted capacities are calculated with the standard OEM sec-  
tor size (512 bytes per logical block) and sparing.  
ST118202FC  
DC power requirements(±5%)1  
+5 V  
+12 V  
Maximum start current  
Maximum operating current  
Average idle current  
0.76A  
0.80A  
0.70A  
3.2A  
1.41A  
1.25A  
1. For more detailed power information, refer to the Cheetah 18FC Product Man-  
ual, publication number 83329330.  
16  
Cheetah 18FC Installation Guide, Rev. A  
Installing the Cheetah 18FC drive  
To install a Cheetah 18FC drive, simply plug the drive directly  
into your system’s Fibre Channel backpanel 40-pin single con-  
nector attachment (FC-SCA). There are no jumpers or termina-  
tors on the drive, and power is supplied through the connector.  
Table 1 on page 25 lists the pin descriptions of the 40-pin FC-  
SCA.  
Read the following general information topics to ensure your  
drive is installed properly:  
Providing adequate cooling  
Mounting the drive  
Formatting the drive  
Providing adequate cooling  
The enclosure design must ensure adequate cooling for the  
drive. The maximum ambient temperature is 50oC (30oC for the  
rated MTBF). Refer to Figure 2 on page 18 for an illustration  
showing suggested air flow patterns.  
The drive’s product manual (83329330) describes how to evalu-  
ate the air-flow design. The evaluation consists of ensuring that  
the case temperatures of certain critical components remain  
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.  
 
Cheetah 18FC Installation Guide, Rev. A  
17  
Figure 2 shows one design approach with one or more fans used  
to generate air flow. The air-flow pattern can be created by the  
fans either pushing or drawing air. The overall flow pattern must  
be directed from side to side in most FC-SCA systems.  
Kühlung des Systems  
Die Gehäusekonstruktion muß eine ausreichende Kühlung des  
Laufwerkes gewährleisten. Die Umgebungstemperatur darf max-  
imal 50oC betragen (30oC für der MTBF).  
Die Produkthandbuch Cheetah 18FC (Dokument 83329330)  
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 Luftstrom  
so zu lenken, daß der geringste Luftstromwiderstand vonvorne  
nach hinten oder von hinten nach vorne verlaufen.  
 
18  
Cheetah 18FC Installation Guide, Rev. A  
Above 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 2: Suggested air flow  
Abbildung 2. Empfohlener Luftstromverlauf  
 
Cheetah 18FC Installation Guide, Rev. A  
19  
Mounting the drive  
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.  
You may mount the drive in any orientation (horizontally, verti-  
cally, or any combination thereof); however, you must ensure that  
the drive receives adequate air flow for cooling.  
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. See  
Figure 3.  
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.  
Installation des Laufwerkes  
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.  
Befestigen Sie das Laufwerk mit vier 6-32-UNC-Schrauben am  
Gehäuse des Host-Systems. Die beiden Seiten des Laufwerkes  
sind mit jeweils zwei Befestigungslöcher versehen, die  
20  
Cheetah 18FC Installation Guide, Rev. A  
Unterseite des Laufwerkes weist vier weitere Befestigungslöcher  
auf. Siehe Abbiludung 3.  
Gemessen von der Außenfläche des Gehäuses dürfen die  
Schrauben maximal 3,81 mm in die Befestigungslöcher des  
Gehüuses hineinragen. Die Schrauben müssen gleichmäßig,  
jedoch nicht zu fest, angezogen werden. Wenn sich eine  
Schraube nicht ohne Widerstand einschrauben läßt, sind die  
Gewinde nicht korrekt aneinander ausgerichtet.  
Cheetah 18FC Installation Guide, Rev. A  
21  
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[1]  
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B
Notes:  
R
Mounting holes are 6-32 UNC 2B, three  
on each side and four on the bottom.  
[1]  
N
-Z- -X-  
Max screw penetration into side of drive  
is 0.15 in. (3.81 mm). Max screw  
tightening torque is 6.0 in-lb (3.32 nm)  
with minimum full thread engagement of  
0.12 in. (3.05 mm).  
A
-Z-  
M
U
-X-  
Dimension Table  
Inches  
1.654 max  
5.787 max  
Millimeters  
P
A
B
C
D
E
F
G
H
J
42.01 max  
147.00 max  
101.60 ± .25  
92.25 ± .25  
3.18 ± .25  
44.45 ± .25  
41.28 ± .50  
28.50 ± .50  
101.60 ± .25  
6.35 ± .25  
41.60 ± .25  
4.60 ± .50  
1.20 max  
[1]  
G
4.000 ± .010  
3.750 ± .010  
0.125 ± .010  
1.750 ± .010  
1.625 ± .020  
1.122 ± .020  
4.000 ± .010  
0.250 ± .010  
1.638 ± .010  
0.181 ± .020  
.040 max  
F
K
L
M
N
P
R
S
T
1.625 ± .020  
1.618 ± .003  
0.315 ± .040  
.015 max  
41.28 ± .50  
41.10 ± .08  
7.00 ± .10  
0.38 max  
U
.015 max  
0.38 max  
E
D
C
-X-  
Figure 3: Dimensions  
Abbildung 3: Laufwerkabmessungen  
 
22  
Cheetah 18FC Installation Guide, Rev. A  
Inserting the drive  
Most systems provide a way to insert the drive using a carrier or  
tray which allows the drive to be hot-plugged into the system’s  
Fibre Channel 40-pin single connector attachment (FC-SCA).  
Refer to your system documentation about the method they pro-  
vide and follow their instructions.  
When installing the drive on a carrier or tray, discharge the static  
electricity from the carrier or tray prior to inserting it into the sys-  
tem.  
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  
which has previously been used to store data).  
Note. Seagate is not responsible for lost user data.  
1. Supply DC power to the drive (power is supplied to the drive  
through the 40-pin FC-SCA).  
2. Format the disc drive. This drive is designed to operate with  
a variety of operating systems. Refer to your system and  
Fibre Channel controller manual for information about  
selecting and formatting the drive.  
Cheetah 18FC Installation Guide, Rev. A  
Enabling and disabling the write cache  
Write caching is a feature that allows the drive to transfer write  
data to its own cache, tell the controller that the task is complete,  
and then actually complete the write at a later time. This  
improves write performance by freeing the CPU to go on to its  
next command.  
Warning.  
Information can be lost if you enable write cache  
and there is a system failure (for example, power  
failure) before the data has actually been physically  
written to the disc.  
OEM drives are shipped with write cache enabled by default. If  
you want to disable the write cache, refer to your system’s drive  
controller and software utility documentation. Seagate provides  
an ASPI utility that you can use in a PC compatible system to  
disable the write cache. It is available on Seagate’s CompuServe  
forum and on the Seagate BBS (refer to “Seagate Technology  
support services” on page 8).  
Connecting remote LEDs  
You can connect remote LEDs using J6 (see Figure 4).  
Connect the anode (usually the longer LED connector) to the  
+5V pin, and the cathode to the appropriate LED output pin. For  
example, if you want to attach an LED which lights up when the  
drive is active (reading or writing), connect the LED’s anode con-  
nector to J6 pin 11 and the cathode, through an appropriate  
external current-limiting resistor, to J6 pin 8 or pin 12.  
24  
Cheetah 18FC Installation Guide, Rev. A  
Drive  
Front  
Pin 1  
J6  
Reserved  
Port A Bypass LED [1]  
Port B Bypass LED [1]  
Fault LED [1]  
Reserved  
Active LED [2]  
+5V  
Active LED [1]  
Ground [3]  
[1] The drive has a 2.2k ohm resistor in series with this LED driver.  
Connect the minus side of an external high-efficiency LED (i.e. 2ma)  
to this pin. Connect the plus side of the LED to +5V.  
[2] An external current limiting resistor is required when connecting an  
LED to this pin. The minus side of the resistor/LED combination is  
connected to this pin. Connect the plus side to +5V. This pin con-  
nects in parallel with the signal of the same name in the J1 interface  
connector.  
[3] Jumper storage location is across pins 2 and 4 (horizontally).  
Figure 4: LED indicator connector (J6)  
 
Cheetah 18FC Installation Guide, Rev. A  
25  
Table 1:  
FC-SCA pin descriptions  
Signal name  
Pin/contact  
Signal type  
1*  
–EN bypass port A  
12 Volts  
TTL output  
2*  
3*  
12 Volts  
4*  
12 Volts  
5*  
–Parallel ESI  
Ground[1]  
Active LED out  
Reserved  
Start_1  
6*  
7*  
Open collector out  
8*  
9*  
TTL input  
10*  
11*  
12*  
13*  
14*  
15*  
16*  
17*  
18*  
19*  
20*  
21  
Start_2  
TTL input  
–EN bypass port B  
SEL_6  
TTL output  
TTL input/output  
TTL input/output  
TTL input/output  
TTL input/output  
Open collector out  
SEL_5  
SEL_4  
SEL_3  
Fault LED out  
Reserved NC  
Reserved NC  
5 Volts  
5 Volts  
12 Volts charge  
Ground  
22  
23  
Ground  
24*  
25*  
+Port A_in  
–Port A_in  
Diff. PECL input pair  
 
26  
Pin/contact  
Cheetah 18FC Installation Guide, Rev. A  
Signal name  
Signal type  
26  
Ground  
27*  
28*  
29  
+Port B_in  
–Port B_in  
Ground  
Diff. PECL input pair  
30*  
31*  
32  
+Port A_out  
–Port A_out  
Ground  
Diff. PECL output pair  
Diff. PECL output pair  
33*  
34*  
35  
+Port B_out  
–Port B_out  
Ground  
36  
SEL_2  
TTL input/output  
TTL input/output  
TTL input/output  
37  
SEL_1  
38  
SEL_0  
39  
Reserved NC  
5 Volts charge  
40  
*Short pins in mating backpanel connector.  
[1] This pin may be connected to external logic to detect the presence of the drive.  
The drive connects this pin to the common ground.  
Cheetah 18FC Installation Guide, Rev. A  
27  
Troubleshooting  
Before calling Seagate Technical Support, please read the pos-  
sibilities discussed below. The suggestions presented here will  
resolve the majority of installation problems.  
General installation troubleshooting  
Check system compatibility. This is a Fibre Channel (FC)  
device. Check your system documentation to ensure that it  
supports FC devices.  
Check the physical attachment. Ensure that the drive is  
properly mated with the backpanel Fibre Channel single  
connector attachment (FC-SCA).  
Check to ensure that drive is receiving power. Insert the  
drive into your system. Listen carefully for the sound of the  
drive motor spinning up. If the drive motor does not spin up,  
check the power supply. If your power supply is functioning  
properly, but the drive does not spin up, contact the com-  
pany from which you purchased the drive.  
Check your system or backpanel documentation to  
ensure you have set options in accordance with the  
manufacturer’s recommendations. All device options,  
including addresses, are set at the backpanel within the  
host system or through system software. Check your host  
system documentation about how to set these options in  
your particular system.  
 
Seagate Technology, Inc.  
920 Disc Drive, Scotts Valley, CA 95066-4544, USA  
Publication Number: 83329320, Rev. A, Printed in USA  

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