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Cheetah 9FC
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Fibre Channel
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ST19101FC
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Installation Guide
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Cheetah 9FC Installation Guide, Rev. A
1
Preface
This manual contains information for users of Seagate Cheetah
9FC (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 9FC Product Manual (part num-
ber 83329210). 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
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
2
Cheetah 9FC 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.
Cheetah 9FC 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, CSA C22.2 950-
M89, 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 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.
4
Cheetah 9FC Installation Guide, Rev. A
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.
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 9FC 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 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 Laufwerk nehmen! Falls die HDA beschädigt ist, schicken
Sie das gesamte Laufwerk zur Reparatur ein.
6
Cheetah 9FC 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, 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.
Cheetah 9FC 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 the appropriate marking for their
product.
8
Cheetah 9FC Installation Guide, Rev. A
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 ques-
tions to DiscSupport @ Seagate.com or TapeSupport @
Seagate.com.
Cheetah 9FC Installation Guide, Rev. A
9
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: 408-434-1080; Tape: 408-456-4415
Thailand
USA
10
Cheetah 9FC Installation Guide, Rev. A
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
Korea
Singapore
Taiwan
USA
81-3-5462-2979
82-2-556-7294/4251
65-488-7528
886-2-715-2923
408-944-9120
Cheetah 9FC Installation Guide, Rev. A
11
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.
(6:00 A.M. to 11:15 A.M., 12:30 P.M. to 5:00 P.M.,
Pacific time, M–F)
SeaTDD™ 408-944-9121
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 6:00 A.M. to
11:15 A.M. and 12:30 P.M. to 5:00 P.M. (Pacific time) Monday
through Friday.
12
Cheetah 9FC Installation Guide, Rev. A
Customer service centers
Seagate direct OEM, Distribution, and System 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 9FC Installation Guide, Rev. A
13
General description
Cheetah 9FC disc drives are high-speed, random-access digital-
data storage devices designed to be used within a host system
with a Fibre Channel-Arbitrated Loop peripheral interface.
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
9FC Product Manual (part number 83329210) contains guide-
lines for a properly designed enclosure.
Figure 1:
Cheetah 9FC disc drive
14
Cheetah 9FC Installation Guide, Rev. A
ST19101FC
Characteristics
Interface
FC-AL
Capacity
Unformatted (Gbytes)
Formatted (Gbytes)1
11.7
9.1
Recording
Cylinders (user)
Read/write data heads
Avg bytes/track
6,526
16
115,078
Seek time
Average read (msec)
Average write (msec)
8.2
9.7
Disc rotation
RPM
Average latency (msec)
10,033
2.99
Data transfer rate
Maximum instantaneous
(Mbytes/sec)
100
1. The specified formatted capacities are calculated with the stan-
dard OEM sector size (512 bytes per logical block) and sparing.
ST19101FC
DC power requirements(±5%)1
+5 V
+12 V
Maximum start current
Maximum operating current
Average idle current
1.04A
1.13A
1.0A
3.19A
1.9A
1.5A
1. For more detailed power information, refer to the Cheetah 9FC Product
Manual, publication number 83329210.
Cheetah 9FC Installation Guide, Rev. A
15
Installing the Cheetah 9FC drive
To install a Cheetah 9FC drive, simply plug the drive directly into
your system’s Fibre Channel backpanel 40-pin single connector
attachment (FC-SCA). There are no jumpers or terminators on
the drive, and power is supplied through the connector. Table
1 on page 24 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 17 for an illustration
showing suggested air flow patterns.
The drive’s product manual (83329210) 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.
16
Cheetah 9FC Installation Guide, Rev. A
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
maximal 50oC betragen (30oC für der MTBF).
Die Produkthandbuch Cheetah 9FC (Dokument 83329210)
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.
Cheetah 9FC Installation Guide, Rev. A
17
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 2: Suggested air flow
Abbildung 2. Empfohlener Luftstromverlauf
18
Cheetah 9FC Installation Guide, Rev. A
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
Cheetah 9FC Installation Guide, Rev. A
19
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.
20
Cheetah 9FC Installation Guide, Rev. A
N
P
A
[1]
F
[3]
C
R
M
D
.01
L
G
Notes:
[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).
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
B
[5]
engagement of 0.12 in. (3.05 mm).
[3] Power and interface connections.
[4] Decorative front panel.
[5] Connector is centered on module ±0.020 in.
(.508 mm).
[2]
Inches
Millimeters
A
B
C
D
E
F
G
H
J
5.750
±
±
±
±
±
±
±
±
±
±
±
±
±
0.010
146.05 ± .25
101.60 ± .25
41.66 ± .51
15.87 ± .50
101.60 ± .13
6.35 ± .13
60.32 ± .25
95.25 ± .25
60.32 ± .25
44.45 ± .50
4.55 ± .38
8.64 ± .38
4.83 ± .25
1.2446 max
43.69 ± .25
104.14 ± .25
4.000
1.640
0.625
4.000
0.250
2.375
3.750
2.375
1.750
0.181
0.340
0.190
0.010
0.020
0.020
0.005
0.005
0.010
0.010
0.010
0.020
0.015
0.015
0.010
K
J
K
L
M
N
P
R
S
0.049 max
1.720
4.100
±
±
0.010
0.010
H
[4]
S
Figure 3: Dimensions
Abbildung 3: Laufwerkabmessungen
Cheetah 9FC Installation Guide, Rev. A
21
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.
22
Cheetah 9FC Installation Guide, Rev. A
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 CompuServe forum and on the Seagate BBS
(refer to “Seagate technical 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 to J6 pin 12.
Cheetah 9FC Installation Guide, Rev. A
23
Drive
Front
Pin 1
J6
Reserved
Port A Bypass LED [1]
Port B Bypass LED [1]
Fault LED [2]
Reserved
Active LED [2]
Reserved
+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)
24
Cheetah 9FC Installation Guide, Rev. A
FC-SCA pin descriptions
Table 1:
Pin/contact
Signal name
Signal type
1*
–EN bypass port A
12 Volts
TTL output
2*
3*
12 Volts
4*
12 Volts
5*
–Parallel ESI
Ground (-DRV present)
Active LED out
Reserved
TTl output
6*
7*
Open collector out
8*
9*
Start_1
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
SEL_5
TTL input
SEL_4
TTL input
SEL_3
TTL input
Fault LED out
Reserved NC
Reserved NC
5 Volts
Open collector out
5 Volts
12 Volts charge
Ground
22
23
Ground
24*
25*
+Port A_in
–Port A_in
Diff. PECL input pair
Cheetah 9FC Installation Guide, Rev. A
25
Pin/contact
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
TTL input
TTL input
37
SEL_1
38
SEL_0
39
Reserved NC
5 Volts charge
40
26
Cheetah 9FC Installation Guide, Rev. A
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-Arbi-
trated Loop (FC-AL) device. Check your system documenta-
tion to ensure that it supports FC-AL 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 documen-
tation about how to set these options in your particular system.
Seagate Technology, Inc.
920 Disc Drive, Scotts Valley, CA 95066-4544, USA
Publication Number: 83329200, Rev. A, Printed in USA
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