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Barracuda 18LP FC
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Disc Drive
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ST318275FC
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ST39175FC
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Installation Guide
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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-
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
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 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
Barracuda 18LP FC Installation Guide, Rev. A
Seagate Technology support services
Online Services
Internet
For online information about Seagate products, visit
Presales Support:
email_tape_presales.shtml or
Technical Support:
®
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 Services—All 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 system’s 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 drive’s 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 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
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 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
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 system’s 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 Seagate’s web site (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 indicates drive
activity, connect the LED’s 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-
ufacturer’s 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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