Seagate BARRACUDA 18LP FC ST318275FC User Manual

Barracuda 18LP FC  
Fibre Channel  
Disc Drive  
ST318275FC  
ST39175FC  
Installation Guide  
Barracuda 18LP FC Installation Guide, Rev. A  
1
Preface  
This manual contains information for users of Seagate Barra-  
cuda 18LP FC (Fibre Channel interface) disc drives. It provides  
technical support information, performance specifications, instal-  
lation instructions, and a troubleshooting section. Additional  
information is available in the Barracuda 18LP FC Product Man-  
ual (part number 77767541). Contact your Seagate sales repre-  
sentative 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 general rule,  
remember that you and the drive electronics must all be  
   
2
Barracuda 18LP FC Installation Guide, Rev. A  
grounded to avoid potentially damaging static discharges.  
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-  
peratures are usually highest.  
 
Barracuda 18LP FC Installation Guide, Rev. A  
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
Barracuda 18LP FC 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.  
 
Barracuda 18LP FC 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-  
tionangegebenen 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
Barracuda 18LP FC 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 Barracuda-Festplattenlaufwerk vorbehaltlich der endgültigen  
Zulasssung im Endprodukt. Designer von Untersystemen sind  
dafür verantwortlich, die Voraussetzungen für die Einhaltung  
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 elektro-  
magnetische Strahlung sind für Designer von Untersystemen auf  
Anfrage von der Seagate-Sicherheitsabteilung erhältlich.  
Barracuda 18LP FC 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 Australias 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
Barracuda 18LP FC Installation Guide, Rev. A  
Seagate Technology support services  
Online Services  
Internet  
For online information about Seagate products, visit  
Presales Support:  
email_presales.shtml or DiscPresales@Seagate.com  
email_tape_presales.shtml or  
Technical Support:  
email_disc_support.shtml or DiscSupport@Seagate.com  
email_tape_support.shtml or TapeSupport@Seagate.com  
®
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). This service is  
available worldwide.  
Automated Services  
SeaFONE® (1-800-SEAGATE)  
is Seagate's toll-free number (1-  
800-732-4283) to access our automated self-help services.  
Using a touch-tone phone, you can find answers to service  
 
Barracuda 18LP FC Installation Guide, Rev. A  
9
phone numbers, commonly asked questions, troubleshooting  
tips and specifications for disc drives and tape drives 24 hours  
daily. International callers can reach this service by dialing +1-  
405-936-1234.  
®
SeaFAX is Seagate's automated FAX delivery system. Using a  
touch-tone phone, you can obtain technical support information  
by return FAX 24 hours daily. This service is available worldwide.  
Presales Support  
Our Presales Support staff can help you determine which  
Seagate products are best suited for your specific application or  
computer system.  
Seagate Express  
You can purchase select tape products and tape accessories  
through Seagate Express 24 hours daily by calling 1-800-531-  
0968 or by faxing your order to: +1-972-481-4812.  
Technical Support  
If you need help installing your drive, consult your dealer. Deal-  
ers are familiar with their unique system configurations and can  
help you with system conflicts and other technical issues. If you  
need additional help, you can talk to a Seagate technical support  
specialist. Before calling, note your system configuration and  
drive model number (ST####).  
SeaTDD(+1-405-936-1687) is a telecommunications device  
for the deaf (TDD). You can send questions or comments 24  
hours daily and exchange messages with a technical support  
10  
Barracuda 18LP FC Installation Guide, Rev. A  
specialist from 8:00 A.M. to 12:15 P.M. and 1:30 P.M. to 6:00  
P.M. (central time) Monday through Friday.  
Customer Service (CSO)  
Warranty Repair  
Seagate offers worldwide customer support for Seagate drives.  
Seagate direct OEM, Distribution and System Integrator custom-  
ers should contact their Seagate service center representative  
for warranty information. Other customers should contact their  
place of purchase.  
Authorized Service Centers  
If you live outside the US, you can contact an Authorized Service  
Center for service or repair.  
USA/Canada/Latin America Support Services  
Presales Support  
Disc: 1-877-271-3285 or  
+1-405-936-1210  
FAX: +1-405-936-1683  
Tape: 1-800-626-6637 or  
+1-714-641-2500  
FAX: +1-714-641-2410  
Technical Support (SeaFONE)  
1-800-SEAGATE or +1-405-936-1234 (for specific product  
phone number)  
FAX: Disc: +1-405-936-1685; Tape: +1-405-936-1683  
SeaFAX  
1-800-SEAGATE  
SeaTDD  
+1-405-936-1687  
SeaBOARD  
Disc: +1-405-936-1600; Tape: +1-405-936-1630  
Barracuda 18LP FC Installation Guide, Rev. A  
11  
Warranty Repair  
USA  
Mexico and  
Latin America  
1-800-468-3472  
FAX: +1-405-949-6740  
FAX: +1-405-949-6738  
+1-405-949-7758  
Authorized Service Centers  
Brazil  
MA Informatica +55-21-516-6649  
FAX: +55-21-516-5280  
FAX: +1-905-660-4951  
Canada  
Memofix  
Adtech  
1
+1-905-660-4936  
+1-905-812-8099 or FAX: +1-905-812-7807  
1-800-624-9857  
1
European Support Services  
For European customer support, dial the toll-free number for  
your specific country for presales support, technical support,  
SeaFAX and warranty repair.  
If your country is not listed here, dial our European call center at  
+31-20-316-7222 from 8:30 A.M. to 5:00 P.M. (European central  
time) Monday through Friday. The European call center is  
located in Amsterdam, The Netherlands.  
Call Center  
Austria  
0 800-20 12 90  
0 800-74 876  
80 88 12 66  
0 800-90 90 52  
0 800-182 6831  
Belgium  
Denmark  
France  
Germany  
1. Authorized Service Centers  
 
12  
Barracuda 18LP FC Installation Guide, Rev. A  
Ireland  
Italy  
1 800-55 21 22  
1 677 90 695  
Netherlands  
Norway  
Poland  
0 800-732 4283  
800-113 91  
00 800-311 12 38  
900-98 31 24  
Spain  
Sweden  
Switzerland  
Turkey  
0 207 90 073  
0 800-83 84 11  
00 800-31 92 91 40  
United Kingdom 0 800-783 5177  
SeaBOARD  
Germany  
+49-89-1409331  
Fax ServicesAll European Countries  
Presales/Technical Support/Warranty Repair +31-20-653-3513  
Africa/Middle East Support Services  
For presales, technical support, warranty repair and FAX ser-  
vices in Africa and the Middle East, dial our European call center  
at +31-20-316-7222 from 8:30 a.m. to 5:00 p.m. (European cen-  
tral time) Monday through Friday, or send a FAX to +31-20-653-  
3513. The European call center is located in Amsterdam, The  
Netherlands.  
Asia/Pacific East Support Services  
Technical Support  
Australia  
Hong Kong  
Japan  
+61-2-9725-3366 FAX: +61-2-9725-4052  
+852-2368 9918  
FAX: +852-2368 7173  
FAX: +81-3-5462-2979  
Barracuda 18LP FC Installation Guide, Rev. A  
13  
Singapore  
Taiwan  
+65-488-7584  
+886-2-2514-2237 FAX: +886-2-2715-2923  
FAX: +65-488-7528  
SeaFAX  
Australia  
+61-2-9756-5170  
Warranty Repair  
Japan  
+81-3-5462-2904 FAX: +81-3-5462-2979  
Asia/Pacific and +65-485-3595  
Australia  
FAX: +65-488-7503  
14  
Barracuda 18LP FC Installation Guide, Rev. A  
General description  
Barracuda 18LP FC disc drives are high-speed, random-access  
digital-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 Barra-  
cuda 18LP FC Product Manual (part number 77767541) con-  
tains guidelines for a properly designed enclosure.  
Figure 1:  
Barracuda 18LP FC disc drive  
 
Barracuda 18LP FC Installation Guide, Rev. A  
15  
Characteristics  
ST39175FC  
ST318275FC  
Interface  
Fibre Channel  
Fibre Channel  
Capacity  
Unformatted (Gbytes)  
Formatted (Gbytes)1  
10.8  
9.1  
21.6  
18.2  
Recording  
Cylinders (user)  
Read/write data heads  
Avg bytes/track  
11,721  
5
186,000  
11,721  
10  
186,000  
Access time  
Average read (msec)  
Average write (msec)  
6.9  
7.8  
6.9  
7.8  
Disc rotation  
RPM  
7,200 (+/- 0.5%) 7,200 (+/- 0.5%)  
Average latency (msec)  
4.17  
4.17  
Data transfer rate  
Maximum instantaneous  
(Mbytes/sec, per port)  
106  
106  
1. The specified formatted capacities are calculated with the standard OEM sector  
size (512 bytes per logical block) and sparing.  
ST39175FC  
ST318275FC  
+5 V +12 V  
DC power requirements(±5%)1  
+5 V  
+12 V  
Maximum start current  
Maximum operating current  
Average idle current  
0.75A  
0.75A  
0.70A  
2.0A  
0.90A  
0.55A  
0.75A 2.0A  
0.75A 1.0A  
0.70A 0.65A  
1. For more detailed power information, refer to the Barracuda 18LP FC Product  
Manual, publication number 77767541.  
16  
Barracuda 18LP FC Installation Guide, Rev. A  
Installing the Barracuda 18LP FC drive  
To install a Barracuda 18LP FC drive, simply plug the drive  
directly into your systems Fibre Channel backpanel 40-pin sin-  
gle connector attachment (FC-SCA). There are no jumpers or  
terminators on the drive, and power is supplied through the con-  
nector. 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 drives product manual (77767541) 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.  
 
Barracuda 18LP FC 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 Barracuda 18LP FC (Dokument  
77767541) enthalten Anweisungen zur Beurteilung der Luft-  
stromkonstruktion. Die Beurteilung muß sicherstellen, daß sich  
die Gehäusetemperatur 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  
Barracuda 18LP FC Installation Guide, Rev. A  
Above unit  
Note. Air flows in the direction shown (front to back)  
or in reverse direction (back to front)  
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  
 
Barracuda 18LP FC 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 systems 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  
Barracuda 18LP FC 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.  
Barracuda 18LP FC Installation Guide, Rev. A  
21  
A
[1]  
M
F
C
L
D
E
Notes:  
B
Mounting holes three on each side,  
6-32 UNC. Max screw length into  
side of drive is 0.15 in. (3.81 mm).  
[1]  
H
1.875±.005  
1.875±.005  
Mounting holes four on bottom,  
6-32 UNC. Max screw length into  
bottom of drive is 0.15 in. (3.81 mm).  
[2]  
on backplane.  
[3]  
[4]  
J
Connector is centered on module  
and flush with end of base.  
Inches  
Millimeters  
K
A
B
C
D
E
F
5.75 ± 0.025  
4.00 ± 0.015  
1.026 max  
146.05 ± .64  
101.6 ± .381  
26.060 max  
15.748 ref  
[2]  
.620 ref  
4.000 ± 0.010 101.600 ± .25  
.250  
+
0.011  
0.005  
6.350 + .28  
N
.12  
H
J
K
L
3.750 ± 0.010  
2.380 ± 0.010  
1.750 ± 0.010  
95.25 ± .25  
60.45 ± .25  
44.450 ± .50  
4.590 + .33  
.18  
41.20 + .69  
.53  
41.150 ± .64  
3.080 max  
3.080 max  
.136  
Motherboard Ref.  
P
(.809)  
[4]  
0.181  
+
+
0.013  
0.007  
0.027  
0.021  
Pin 1  
M
1.622  
Low  
Common centerline  
in the horizontal  
(X axis) direction  
of the drive  
[3]  
R
Profile  
N
P
R
1.620 ± 0.025  
.1215 max  
.1215 max  
Half  
Height  
Figure 3: Dimensions  
Abbildung 3: Laufwerkabmessungen  
 
22  
Barracuda 18LP FC 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 systems  
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  
unless you intend to erase all user 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.  
Barracuda 18LP FC Installation Guide, Rev. A  
23  
Enabling 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 disabled by default to  
enhance data integrity. If you want to enable the write cache,  
refer to your systems drive controller and software utility docu-  
mentation. Seagate provides an ASPI utility that you can use in a  
PC compatible system to enable the write cache. It is available  
on Seagates web site (refer to Seagate Technology support  
serviceson 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 indicates drive  
activity, connect the LEDs anode connector to J6 pin 11 and the  
cathode to J6 pin 12 or connect to J6 pin 8 through an appropri-  
ate external current-limiting resistor.  
Note. The LED is on when the drive is idle and off when the  
drive is processing commands.  
24  
Barracuda 18LP FC 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. Tie 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. Connect the minus  
side of the resistor/LED combination to this pin. Con-  
nect the plus side to +5V. This pin is connected in  
parallel with the signal of the same name in the inter-  
face connector (J1).  
[3] Jumper storage location (across pins 2 and 4).  
Figure 4: LED indicator connector (J6)  
 
Barracuda 18LP FC 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  
Barracuda 18LP FC 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.  
Barracuda 18LP FC 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 con-  
nector 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 company  
from which you purchased the drive.  
Check your system or backpanel documentation to  
ensure you have set options in accordance with the man-  
ufacturers recommendations. All device options, including  
addresses, are set at the backpanel within the host system or  
through system software. Check your host system documenta-  
tion about how to set these options in your particular system.  
 
Seagate Technology, Inc.  
920 Disc Drive, Scotts Valley, CA 95066-4544, USA  
Publication Number: 77767542, Rev. A, Printed in USA  

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