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Disc Drive
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ST118202LW/LC
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Cheetah 18 Installation Guide, Rev. A
1
Preface
This manual contains information for users of the Seagate®
Cheetah 18 SCSI disc drives. It provides support services, per-
formance specifications, and initial setup information. Additional
information is available in the Cheetah 18 Product Manual (part
number 83329260). 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 general rule,
remember that you and the drive electronics must all be
grounded to avoid potentially damaging static discharges.
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2
Cheetah 18 Installation Guide, Rev. A
• Turn off the power before removing or installing the DC power
cable.
• Do not remove any circuit boards from the drive.
• Never use an ohmmeter on any circuit boards.
• When installing the drive on a carrier or tray, discharge the car-
rier 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
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Cheetah 18 Installation Guide, Rev. A
3
stacked vertically, pay special attention to the top where tem-
peratures are usually highest.
• Follow the precautions listed above in “Electrostatic discharge
protection.”
• Do not remove any circuit boards from the drive. Return the
entire drive for depot repair if any circuit board is defective.
Removal of circuit boards by personnel not performing depot
repair will damage components and may void the warranty.
• Do not separate the head and disc assembly (HDA) from the
PCB. Return the entire drive for depot repair if the HDA is
defective.
• Do not attempt to disassemble the HDA. It is not field repair-
able. If the sealed HDA is opened by personnel not performing
depot repair, this will damage components and void the
warranty.
As a component, this drive is designed to be installed and oper-
ated in accordance with UL1950, EN60950, CAN/CSA C22.2
950-95, and VDE0805.
Seagate takes all reasonable steps to ensure that its products
are certifiable to currently accepted standards. Typical applica-
tions of these disc drives include customer packaging and sub-
system design. Safety agencies conditionally certify component
assemblies, such as the Cheetah disc drive, based on their final
acceptability in the end-use product. The subsystem designers
are responsible for meeting these conditions of acceptability in
obtaining safety-regulatory agency compliance in their end-use
products and for certifying where required by law. A necessary
part of meeting safety requirements is the provision for overcur-
rent protection on drive SELV supply voltages.
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4
Cheetah 18 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.
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Cheetah 18 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.
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6
Cheetah 18 Installation Guide, Rev. A
• Die vormontierte Kopf- und Festplatteneinheit (HDA) nicht aus
dem Laufwerkgehäuse nehmen! Falls die HDA beschädigt ist,
schicken Sie das gesamte Laufwerk zur Reparatur ein.
• Die HDA ist nicht vor Ort reparierbar und darf nicht auseinan-
dergenommen werden! Öffnen der versiegelten HDA durch
andere Personen als die für die werkseitige Reparatur zustän-
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
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-
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Cheetah 18 Installation Guide, Rev. A
7
magnetische Strahlung sind für Designer von Untersystemen auf
Anfrage von der Seagate-Sicherheitsabteilung erhältlich.
Regulatory agency compliance
Electromagnetic susceptibility
As a component assembly, the drive is not required to meet any
susceptibility performance requirements. It is the responsibility of
those integrating the drive within their systems to perform those
tests required and design their system to ensure that equipment
operating in the same system as the drive or external to the sys-
tem does not adversely affect the performance of the drive. See
DC power requirements on page 18.
Electromagnetic compliance
Seagate uses an independent laboratory to confirm compliance
to the directives/standard(s) for CE Marking and C-Tick Marking.
The drive was tested in a representative system for typical appli-
cations. The selected system represents the most popular char-
acteristics for test platforms. The system configurations include:
• 486, Pentium, and PowerPC microprocessors
• 3.5-inch floppy disc drive
• Keyboard
• Monitor/display
• Printer
• External modem
• Mouse
Although the test system with this Seagate model complies to
the directives/standard(s), we cannot guarantee that all systems
will comply. The computer manufacturer or system integrator
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8
Cheetah 18 Installation Guide, Rev. A
shall confirm EMC compliance and provide CE Marking and C-
Tick Marking for their product.
Electromagnetic compliance for the European Union
If this model has the CE Marking it complies with the European
Union requirements of the Electromagnetic Compatibility Direc-
tive 89/336/EEC of 03 May 1989 as amended by Directive 92/31/
EEC of 28 April 1992 and Directive 93/68/EEC of 22 July 1993.
Australian C-Tick
If this model has the C-Tick Marking it complies with the Austra-
lia/New Zealand Standard AS/NZS3548 1995 and meets the
Electromagnetic Compatibility (EMC) Framework requirements
of Australia’s Spectrum Management Agency (SMA).
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Cheetah 18 Installation Guide, Rev. A
Seagate Technology support services
Presales support
9
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)
e-mail: [email protected]
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
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10
Cheetah 18 Installation Guide, Rev. A
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://
or Seagate’s ftp server
. You can also send E-mail with your questions
DiscSupport @ Seagate.com TapeSupport @
ftp.seagate.com)
to
Seagate.com
or
.
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).
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Cheetah 18 Installation Guide, Rev. A
11
Location
Australia
France
Germany
Taiwan
Thailand
UK
Phone number
61-2-9756-2359
33 1-48 25 35 95
49-89-140-9331
886-2-2719-6075
662-531-8111
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
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12
Cheetah 18 Installation Guide, Rev. A
Location
Phone number
49-89-1430-5100
Germany
Hong Kong 852-2368 7173
Japan
Korea
Singapore
Taiwan
UK
81-3-5462-2979
82-2-556-4251/7395
65-488-7528
886-2-2715-2923
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
Taiwan
to 5:00
, M–F)
886-2-2514-2237
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Cheetah 18 Installation Guide, Rev. A
13
Location
Phone number
A.M.
P.M.
,
UK
44-1628-894083 (10:00
to 1:00
P.M.
P.M.
2:00
to 5:00
, M–F)
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
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
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14
Cheetah 18 Installation Guide, Rev. A
Phone number FAX number
Location
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
Mexico
Abicom Seamax
SA DE CV
Southern Europe
Caesar Italia
525-546-4888
39-688-18149
525-546-4888
39-688-02103
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Cheetah 18 Installation Guide, Rev. A
15
General description
Cheetah 18 SCSI disc drives are high-speed, random-access
digital-data storage devices capable of operating in single-ended
(SE) or low voltage differential (LVD) modes.
These two modes are offered to allow you to use this drive in
systems that use the traditional SE technology or to use it in
LVD-capable systems. Refer to page 20 for additional informa-
tion about LVD technology.
The drive is a component for installation in an enclosure
designed for the drive. This is often a rack within the system or
an external enclosure designed to house one or more disc drives
or other peripheral units. In either case, the disc drive must
receive adequate cooling (refer to “Providing adequate cooling”)
and it must be sufficiently grounded and shielded from emis-
sions. The Cheetah 18 Product Manual (part number 83329260)
contains guidelines for a properly designed enclosure.
Attention. This high performance Cheetah disc drive must have
proper power and cooling for reliable operation.
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16
Cheetah 18 Installation Guide, Rev. A
Figure 1. Cheetah 18 family drive (ST118202LW shown)
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Cheetah 18 Installation Guide, Rev. A
17
Characteristics
ST118202LW/LC
Interface
Ultra2 SCSI1
Capacity
Unformatted (Gbytes)
Formatted (Gbytes)2
22.54
18.21
Recording
Cylinders (user)
Read/write data heads
Avg bytes/track
6,962
24
104,840-159,008
Access time3
Average read (msec)
Average write (msec)
5.9
6.7
Disc rotation
RPM
Average latency (msec)
10,025
2.99
Synchronous data transfer rate
Maximum instantaneous (Mbytes/sec)
40 (SE mode)
80 (LVD mode)
Asynchronous data transfer rate
Maximum instantaneous (2 bytes wide)
(Mbytes/sec)
10.0
Multi-segmented cache (kbytes)
1,024 standard
4,096 optional
1.
2.
Also operates per SCSI-1/SCSI-2/SCSI-3 protocols.
The specified formatted capacities are calculated with the standard
OEM sector size (512 bytes per logical block) and sparing.
Includes on-board controller overhead.
3.
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18
Cheetah 18 Installation Guide, Rev. A
ST118202LW/LC
Low voltage
Single-ended (SE)
differential (LVD)
mode
mode
DC power requirements (±5%)1
+5 V
+12 V
+5 V
+12 V
Maximum start current
Maximum operating current
Average idle current
0.89A
0.88A
0.72A
2.5A
1.22A
0.98A
0.90A
0.95A
0.74A
2.5A
1.22A
0.98A
1.
For more detailed power information, refer to the Cheetah 18 Product
Manual, publication number 83329260.
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Cheetah 18 Installation Guide, Rev. A
19
Initial setup information
The general information beginning on this page applies to all of
the Cheetah 18 drive models. After reading the general informa-
tion topics, refer to the appropriate drive-specific section listed
below for additional information about configuring and installing
your particular model.
Drive models
Page
ST118202LW
39
ST118202LC
45
General information
The following general information topics are discussed:
• Single-ended and low voltage differential modes
• SCSI ID jumpers
• Drive termination
• Terminator power
• Interface drivers and data path width notes
• Other applicable jumper options
• Providing adequate cooling
• Mounting the drive and connecting cables1
• Formatting the drive
1This mounting procedure does not apply to “LC” model drives.
To mount an “LC” drive, plug the drive into the system’s single
connector attachment (SCA) position on the system’s back
panel.
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20
Cheetah 18 Installation Guide, Rev. A
Single-ended and low voltage differential modes
This drive incorporates two different transceivers to allow you to
use it in traditional systems which may use single-ended (SE)
drivers and receivers, or to use it in low voltage differential (LVD)
capable systems which use LVD drivers and receivers.
You can configure the drive to switch between SE and LVD
modes automatically or force it to operate in SE mode only as
described later in this guide.
LVD technology enhances parallel SCSI I/O performance,
reduces power consumption, increases allowable cable lengths,
and improves device connectivity beyond SE capabilities.
Note.
To operate at the Ultra2 SCSI rates in LVD mode, all
devices on the same bus must be running in LVD mode. If
you add any single-ended device to a bus that is operat-
ing in LVD mode, all devices drop back to operating in
single-ended mode. This eliminates the possibility of
reaching Ultra2 SCSI transfer rates.
Warning.
Do not mix LVD drives on the same daisy chain with
devices having high voltage differential (HVD) inter-
face circuits.
SCSI ID jumpers
Each device on the SCSI chain must have a unique SCSI ID.
The host system’s SCSI controller usually uses the ID that has
the highest priority interrupt in the SCSI I/O system. This is
always ID7. ID0 has the lowest priority in an 8-bit I/O system. ID8
has the lowest priority in a 16-bit I/O system. The lower priority
SCSI IDs are normally used for other SCSI devices such as this
Cheetah disc drive.
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Cheetah 18 Installation Guide, Rev. A
21
Note. Most SCSI controllers (host adapters) allow you to skip a
SCSI ID. For example, you can have ID0, ID1, and ID3
(skipping ID2). Other controllers do not allow this so be
sure to refer to your system or controller user’s manual
for details about its requirements for proper SCSI device
installation.
Note. This drive is SCAM (SCSI Configured Auto Magically)
compliant. If the system into which you are installing this
drive requires SCAM compliant drives, you do not need
to be concerned about the drive ID jumper settings, as
the system automatically assigns your new drive the ID it
wants it to have. The system may or may not use the
existing drive ID jumper settings. Setting the drive ID
doesn’t hurt anything, but is not necessary in a SCAM
compliant system.
Most Cheetah disc drives are factory set with the SCSI ID set at
0. To change the SCSI ID, refer to the appropriate drive section
for your model.
If, after completing the installation process, the drive’s LED does
not show on/off activity when the host is trying to communicate
with the drive, a duplicate SCSI ID may be the problem. If this is
the case, change the ID so that each device on the SCSI chain
has its own unique ID. Also check your system or controller
user’s manual to ensure that you have not violated its SCSI ID
numbering recommendations.
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22
Cheetah 18 Installation Guide, Rev. A
Drive termination
If you are installing a Cheetah drive in a system that has other
SCSI devices installed, terminate only the end devices on the
SCSI chain. A SCSI “device” is any disc drive, scanner, tape
backup unit, or other piece of hardware connected to your sys-
tem using the SCSI bus.
Note.
Use active (ANSI SCSI-2 Alternative 2) single-ended ter-
minators when terminating a bus operating in single-
ended mode. Use SPI-2-compliant active low voltage dif-
ferential terminators when terminating a SCSI Ultra2 bus
operating in LVD mode.
The top example in Figure 2 shows an internal hard disc at one
end of the SCSI bus with the SCSI controller at the other end
(both are terminated). The bottom example shows two additional
SCSI devices connected externally—this means the SCSI con-
troller is no longer on the end of the SCSI chain and should not
be terminated.
Note.
Some controllers prefer to remain terminated even if they
are in the middle of the chain. Also, some controllers treat
the internal and external chains as separate logical
buses. This means you may need to terminate both the
first and last devices on both logical buses to achieve
proper termination. If necessary, refer to your system or
controller documentation to see how this is handled in
your particular system.
These drives do not have on-board terminators, so you must ter-
minate external to the drive when termination is required. For
ST118202LC drives, this is normally accomplished by terminat-
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Cheetah 18 Installation Guide, Rev. A
23
ing the bus at the backpanel. For ST118202LW drives, use an in-
line terminator on the cable.
Internal SCSI cable
Internal
Internal
Controller
SCSI device SCSI device
Terminate
Internal SCSI cable
External
SCSI
cable
Internal
Internal
SCSI device SCSI device
External
External
Controller
SCSI device SCSI device
Terminate
Figure 2. SCSI bus termination
Terminator power
You usually will not need to change this option and can normally
leave the drive configured as it was shipped from the factory. For
information about how to change the terminator power option on
your drive, refer to the appropriate drive-specific section.
I/O circuits and data path widths
• These drives can be used in single-ended or low voltage differ-
ential interface systems; however, do not attempt to mix these
drives on the same daisy chain with high voltage differential
devices. The circuits are not compatible and drive damage
may occur.
• These drives have a “wide” (16-bit) SCSI data bus rather than
the standard (non-wide) 8-bit SCSI data bus; however, you
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24
Cheetah 18 Installation Guide, Rev. A
can use these wide drives on a standard (non-wide) 8-bit data
bus if you provide proper termination to the upper 8-bit data
lines. This is often referred to as providing “high-9 termina-
tion.”
Figures 3, 4, and 5 show typical drive connections.
The following table lists the maximum cable lengths and number
of devices using single-ended and LVD I/O circuits allowed on a
daisy-chain cable for 10, 20, and 40 Mtransfers/sec I/O data
transfer rates.
Table 1.
Cable characteristics for SE and LVD circuits
Maximum
number of
devices on
bus
SCSI
driver
type
I/O transfer rate
(Mtransfers/s)
Maximum cable
length allowed
SE
SE
SE
LVD
10
20
20
40
16
4
6 meters (19.7 ft.)
3 meters (9.8 ft.)
1.5 meters (4.9 ft.)
12 meters (39.4 ft.)
8
16
A maximum of 16 devices can be connected on a 16-bit wide
data bus.
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26
Cheetah 18 Installation Guide, Rev. A
“LW” Model
Drive
Note:
Terminator
Do not mix
“LW” and “WD”
model drives
on the daisy
chain.
[2]
2 through X
SCSI devices [1]
Pin 1
SCSI ID 1
(check your
adapter for Pin 1 location)
SCSI ID 7
Terminated
Host Adapter
PCB
SCSI ID 0
[1] “X” means up to 15 or the maximum allowable number of devices on
the SCSI bus. See system documentation and Table 1.
[2] External terminator. Used only on end “LW” drive. Use only SPI-2-
compliant active LVD terminators on SCSI Ultra2 buses.
Figure 5. Multiple-drive connection to host adapter
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Cheetah 18 Installation Guide, Rev. A
27
80-pin
SCSI I/O
Connector
Pin 1
J2
J6
Note. This drive model plugs directly into a backplane connec-
tor and therefore does not use cables.
Figure 6. Drive model “LC” with single 80-pin I/O and
power connector
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28
Cheetah 18 Installation Guide, Rev. A
Providing adequate cooling
The enclosure design must ensure adequate cooling for the
drive. The maximum ambient temperature allowed is 50°C.
The drive’s product manual (83329260) describes how to evalu-
ate the air-flow design. The evaluation consists of ensuring that
the case temperature of certain critical components remains
within acceptable limits during drive operation.
We recommend orienting the drive or directing the air flow in a
way that creates the least amount of air-flow resistance while
providing air flow above the circuit boards and around the head
and disc assembly (HDA). Also, choose the shortest possible
path between the air inlet and exit. This minimizes the distance
traveled by air that is heated by the drive and by other nearby
heat sources.
Figure 7 shows two design approaches with one or more fans
used to generate air flow. The air-flow patterns can be created
by the fans either pushing or drawing air. The overall flow pattern
can be directed from front to back, back to front, or side to side.
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Cheetah 18 Installation Guide, Rev. A
29
Kühlung des Systems
Die Gehäusekonstruktion muß eine ausreichende Kühlung des
Laufwerkes gewährleisten. Die Umgebungstemperatur darf max-
imal 50°C betragen.
Die Produkthandbuch Cheetah 18 (Dokument 83329260)
enthalten Anweisungen zur Beurteilung der Luftstromkonstruk-
tion. Die Beurteilung muß sicherstellen, daß sich die Gehäuse-
temperatur bestimmter kritischer Komponenten bei
Laufwerkbetrieb innerhalb zugelassener Grenzen hält.
Wir empfehlen, das Laufwerk so zu orientieren oder den Luft-
strom so zu lenken, daß der geringste Luftstromwiderstand
erzeugt wird und gleichzeitig ein Luftstrom über den Platinen
und um die Kopf- und Festplatteneinheit (HDA) gegeben ist.
Wählen Sie einen möglichst kurzen Weg zwischen Lufteinlaß
und -auslaß. Dadurch wird die Strecke, die die vom Laufwerk
und anderen nahegelegenen Hitzequellen aufgewärmte Luft
zurücklegt, auf ein Minimum beschränkt.
Abbildung 7 zeigt zwei Konstruktionsmöglichkeiten, bei denen
ein oder mehrere Lüfter den Luftstrom erzeugen. Der Luftstrom-
verlauf wird durch die Lüfter gesteuert, die entweder Luft einbla-
sen oder abziehen. Generell kann der Luftstrom entweder von
vorne nach hinten oder von hinten nach vorne verlaufen.
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30
Cheetah 18 Installation Guide, Rev. A
.
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 7. Suggested air flow
Abbildung 7. Empfohlener Luftstromverlauf
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Cheetah 18 Installation Guide, Rev. A
31
Mounting the drive and connecting cables
Do not touch the connector pins or any components on the con-
trol board without observing static-discharge precautions.
Always handle the drive by the frame only.
The drive may be mounted in any orientation (horizontally, verti-
cally, and any combination thereof); however, you must ensure
that the drive receives adequate air flow for cooling.
1. Mount the drive to the host system’s chassis using four 6-32
UNC screws. Two mounting holes are in each side of the
drive and there are four mounting holes in the bottom of the
drive.
The maximum length that the screws should extend into the
chassis mounting holes is 0.15 inch (3.81 mm), measured
from the outer surface of the chassis. Tighten the screws
down evenly. Do not over-tighten or force the screw if it does
not seem to screw in easily, because this means the threads
are not properly aligned. In this case, back the screw out
and try again.
Installation des Laufwerkes
und Anschluß der Kabel
Beachten Sie beim Handhaben und Anfassen der Anschlußstifte
und Komponenten die Vorsichtsmaßnahmen zur Verhinderung
statischer Aufladung. Fassen Sie das Laufwerk nur am Rahmen
an.
Das Laufwerk kann in beliebiger Orientierung (horizontal, ver-
tikal oder schräg) installiert werden; jedoch muß dafür gesorgt
werden, daß ein ausreichender Luftstrom zur Kühlung des Lauf-
werkes vorhanden ist.
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32
Cheetah 18 Installation Guide, Rev. A
1. Befestigen Sie das Laufwerk mit vier 6-32-UNC-Schrauben
am Gehäuse des Host-Systems. Die beiden Seiten des
Laufwerkes sind mit jeweils zwei Befestigungslöchern
versehen, die Unterseite des Laufwerkes weist vier weitere
Befestigungslöcher auf.
Gemessen von der Außenfläche des Gehäuses dürfen die
Schrauben maximal 3,81 mm in die Befestigungslöcher des
Gehüuses hineinragen. Die Schrauben müssen gleich-
mäßig, jedoch nicht zu fest, angezogen werden. Wenn sich
eine Schraube nicht ohne Widerstand einschrauben läßt,
sind die Gewinde nicht korrekt aneinander ausgerichtet. In
diesem Fall die Schraube nicht in das Gewindeloch
forcieren, sondern die Schraube herausnehmen und erneut
in das Gewindeloch einführen.
2. Verify that all connections between the drive and the host
system are correctly installed.
2. Prüfen Sie, ob alle Verbindungen zwischen dem Laufwerk
und dem Host-System korrekt hergestellt sind.
3. Verify that you have correctly installed jumpers.
3. Stellen Sie sicher, daß die Kennungsbrücken installiert sind.
4. Connect the SCSI cable into the drive’s SCSI connector.
Take care not to stretch or crimp this cable, and do not block
the system’s cooling air flow with the cable.
The drive receives DC power through a 4-pin connector
mounted next to the SCSI connector. The output of a power
supply must meet SELV (safety extra low voltage) as
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Cheetah 18 Installation Guide, Rev. A
33
defined in IEC 950. Figure 8 provides the pin information for
the DC power connector. To connect the DC power cable to
the drive, simply insert the cable end into the drive’s DC
power connector.
4. Schließen Sie das SCSI-Kabel an den SCSI-Steckverbinder
des Laufwerkes an. Das Kabel darf nicht gedehnt oder
gedrückt werden und es darf den Luftstrom zur Kühlung des
Systems nicht behindern.
Das Laufwerk wird über einen 4-poligen, neben dem SCSI-
Anschluß befestigten Steckverbinder mit Gleichstrom ver-
sorgt. Der Ausgang eines Netzteils muß SELV (safety extra
low voltage) nach IEC 950 entsprechen. Abbildung 8 zeigt
die Steckerbelegung für den Gleichstromanschluß. Zum
Anschluß des Gleichstromkabels an das Laufwerk das
Kabelende in den Gleichstromanschluß des Laufwerkes
stecken.
Pin
1
Power
Pin Gleichstrom
+12V
1
2
3
4
+12 V
2
+12V return
+ 5V return
+ 5V
+12 V Rückleitung
+ 5 V Rückleitung
+ 5 V
3
4
4
3
2
1
Figure 8. DC power connector
Abbildung 8. Gleichstromanschluß
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34
Cheetah 18 Installation Guide, Rev. A
Note. Signal ground on the power control board assembly
(PCBA) and the head and disc assembly (HDA) are con-
nected together in this drive and you cannot separate
them. The equipment in which you have mounted the
drive is connected directly to the HDA and PCBA without
electrically isolating shock mounts. Maximizing the con-
ductive contact area between HDA ground and system
ground may reduce radiated emissions.
If you do not want the system chassis to be connected to
the HDA/PCB ground, you must provide a nonconductive
(electrically isolating) method of mounting the drive in the
host system. This may increase radiated emissions and
is the system designer’s responsibility.
Hinweis.
Die Signalerde auf der Stromregelungskarte (PCBA) und
der Kopf- und Festplatteneinheit (HDA) sind in diesem
Laufwerk miteinander verbunden und können nicht
getrennt werden. Das Gerät, in das Sie das Laufwerk
eingebaut haben, ist ohne elektrisch isolierende
Stoßdämpfer direkt an die HDA und PCB angeschlossen.
Die elektromagnetische Strahlung kann reduziert wer-
den, indem Sie eine möglichst große leitende Kontak-
fläche zwischen der HDA-Erdung und der Systemerdung
vorsehen.
Wenn Sie das Systemgehäuse nicht an die HDA/PCBA-
Erdung anschließen wollen, müssen Sie das Laufwerk
auf nichtleitende Weise (galvanisch isoliert) im Host-Sys-
tem einbauen. Die daraus u.U. resultierende verstärkte
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Cheetah 18 Installation Guide, Rev. A
35
elektromagnetische Strahlung fällt in den Zuständigkeits-
bereich des Systemdesigners.
5. Replace the host system’s cover.
5. Setzen Sie das Gehäuseoberteil des Host-Systems wieder
auf.
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36
Cheetah 18 Installation Guide, Rev. A
K
//
T
-Z-
S
[1]
-Z-
H
L
J
B
R
Notes:
Mounting holes are 6-32 UNC 2B, three
[1]
A
on each side and four on the bottom.
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).
-Z-
M
U
-X-
P
Dimension Table
Inches
1.654 max
5.787 max
Millimeters
[1]
G
F
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
4.000 ± .010
3.750 ± .010
.125 ± .010
1.750 ± .010
1.625 ± .020
1.122 ± .020
4.000 ± .010
.250 ± .010
1.638 ± .010
.181 ± .020
K
L
M
P
R
S
T
1.625 ± .020
.265 ± .010
.315 ± .040
.015 max
41.28 ± .50
6.73 ± .25
7.00 ± .10
0.38 max
0.38 max
U
.015 max
E
D
C
-X-
Figure 9. Mounting configuration dimensions (LW model)
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Cheetah 18 Installation Guide, Rev. A
37
K
//
T
-Z-
S
[1]
-Z-
H
L
J
B
R
Notes:
N
-Z- -X-
Mounting holes are 6-32 UNC 2B, three
[1]
on each side and four on the bottom.
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
Millimeters
P
A
B
C
D
E
F
G
H
J
1.654 max
5.787 max
4.000 ± .010
3.750 ± .010
.125 ± .010
1.750 ± .010
1.625 ± .020
1.122 ± .020
4.000 ± .010
.250 ± .010
1.638 ± .010
.181 ± .020
.040 max
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
41.61 ± .25
4.60 ± .50
1.20 max
[1]
G
F
K
L
M
N
P
R
S
T
1.625 ± .020
2.618 ± .010
.276 ± .040
.015 max
41.28 ± .50
66.50 ± .25
7.00 ± 1.02
0.38 max
U
.015 max
0.38 max
E
D
C
-X-
Figure 10. Mounting configuration dimensions (LC model)
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38
Cheetah 18 Installation Guide, Rev. A
Formatting the drive
Warning.
Formatting a drive erases all user data. Be sure that
you understand this principle before formatting any
hard disc drive. It is not necessary to format a drive
that previously has been used to store data, unless
your intention is to erase all user data.
Note.
Seagate is not responsible for lost user data.
1. Turn on DC power.
2. Boot the system from a system floppy disc or from a previ-
ously installed hard disc drive if there is one.
3. Format the disc drive. Cheetah 18 disc drives are designed
to operate with a variety of operating systems. Please refer
to your system or SCSI controller manual for information
about formatting and setting up the drive. Some quick desk-
top system notes are provided below.
Quick reference desktop system notes
• Hardware platform, operating system, and host adapter varia-
tions can limit access to the full capacity of this and other high
capacity drives. Refer to your system or utility manual for
detailed instructions.
• DOS/Windows 3.1/Windows 95. Set the drive type in CMOS to
“Zero,” “None,” or “No hard drive installed.” Use FDISK.EXE
and FORMAT.EXE.
• Macintosh. Use a third-party drive utility or Apple’s Drive Setup
(version 1.3.1 or later) to initialize the drive. Note: versions of
Apple Drive Setup prior to version 1.3.1 do not recognize non-
Apple drives.
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Cheetah 18 Installation Guide, Rev. A
39
LW drives
Setting the SCSI IDLWjumdrpiveers section
Use the J6 connector to set the SCSI ID (see Figure 11). To
change the SCSI ID, install jumpers as shown in the illustration.
Drive
Front
Jumper Plug
(enlarged to
show detail)
Pin 1
J6
SCSI ID = 0
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
SCSI ID = 7
SCSI ID = 8
SCSI ID = 9
SCSI ID = 10
SCSI ID = 11
SCSI ID = 12
SCSI ID = 13
SCSI ID = 14
SCSI ID = 15
Figure 11. Setting the SCSI ID on ST118202LW drives
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40
LW drives
Terminating the drive
Cheetah 18 Installation Guide, Rev. A
ST118202LW drives do not have internal terminators or any
other way of adding internal termination to the drive. You must
provide external termination to these drives when termination is
required. This is normally done by adding an in-line terminator
on the cable.
Note.
Use active (ANSI SCSI-2 Alternative 2) single-ended ter-
minators when terminating a bus operating in single-
ended mode. Use SPI-2-compliant active low voltage dif-
ferential terminators when terminating a SCSI Ultra2 bus
operating in LVD mode.
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Cheetah 18 Installation Guide, Rev. A
41
LW drives
Terminator power
You can configure this drive to supply termination power to the
SCSI bus by placing a jumper on J2 pins 1 and 2. The default
setting is no jumper, meaning that some other source (other than
this drive) is suppling termination power to the SCSI bus.
Pin 1
J2
Pin 2
R R
T D MW P E E T
E S E P D S S P
Term. Power to SCSI Bus
Host adapter or other device provides
term power to external terminator
J2
J6
Drive
Front
J2 Jumper Plug
(enlarged to
show detail)
Figure 12. Setting terminator power jumpers
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42
LW drives
Cheetah 18 Installation Guide, Rev. A
Other applicable jumper options
Several other jumper options are available as illustrated.
Pin 1
Pin 2
J2
R R
S D MW P E E
E S E P D S S
T
P
Reserved
Single-Ended Mode option
Use single-ended or low voltage differential mode.
Force the drive to operate only in single-ended mode.
Delay Motor Start option
(valid only if the Enable Motor Start jumper is not connected)
Disable the Delay Motor Start option (default).
Motor start delay equal to the SCSI ID multiplied by 12 seconds.
For example, if the SCSI ID = 2, the drive starts in 24 seconds.
Motor Start option
Disable motor start (default). The drive starts according to the
Delay Motor Start option.
Enable motor start. The drive waits for the Start Unit command
from the host before starting the spindle motor.
Write Protect option
Write protect = Off (enables writing – default).
Write protect = On (disables writing).
Parity Check option
Enable parity check of SCSI bus (default).
Disable parity check.
J2
J6
Drive
Front
J2 Jumper Plug
(enlarged to
show detail)
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Cheetah 18 Installation Guide, Rev. A
43
LW drives
68 Pin
SCSI I/O Connector
J1
Pin 1
J5/J1A [2][4]
Pin 1
4P
3P 2P
1P
J1-DC Power
Pin 12
SCSI ID = 0
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
SCSI ID = 7
SCSI ID = 8
SCSI ID = 9
SCSI ID = 10
SCSI ID = 11
SCSI ID = 12
SCSI ID = 13
SCSI ID = 14
SCSI ID = 15
J1A Pin 1
SCSI Address A0
SCSI Address A1
SCSI Address A2
SCSI Address A3
No connection
+5V
Fault LED*
Vendor Unique*
Reserved
Activity LED*
Ground
* These pins are driven low for
250 ms after PWR ON or
RESET to allow jumper
selectable SCSI ID as shown
to the right.
Figure 13. Additional jumper options
Figure 14. Alternate ID select and LED connection
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44
LW drives
Drive Active indicator
Cheetah 18 Installation Guide, Rev. A
The drive Active LED indicator connections are shown below.
Drive
Front
Jumper Plug
(enlarged to
show detail)
Pin 1
J6
Reserved
Activity LED
Reserved
CATH
The shaded pins are shipped
with a cover installed. Do not
install jumpers on these pins.
Retain the cover unless you
install a 20-pin plug.
Note: On some LEDs the flat
side of indicator is cathode.
Figure 15. Drive Active LED indicator connections
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Cheetah 18 Installation Guide, Rev. A
45
LC drives
Setting the SCSI IDLCjumdrpiveers section
The SCSI ID for ST118202LC drives is normally set over the
SCSI bus by the host system. You can also use the J6 jumper
block to set the SCSI ID (see Figure 16).
Drive
Front
Jumper Plug
(enlarged to
show detail)
Pin 1
J6
SCSI ID = 0
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
SCSI ID = 7
SCSI ID = 8
SCSI ID = 9
SCSI ID = 10
SCSI ID = 11
SCSI ID = 12
SCSI ID = 13
SCSI ID = 14
SCSI ID = 15
(default)
Note:
[1] Do not remove
cover from pins
13 through 20
(darkened area).
Figure 16. Setting the SCSI ID on ST118202LC drives
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46
Cheetah 18 Installation Guide, Rev. A
LC drives
Terminating the drive
LC model drives do not have internal terminators or any other
way of adding internal termination to the drive. You must provide
external termination to these drives when termination is
required. Since this drive is designed to be plugged into a back-
panel or other host enclosure without cabling, this is normally
done by enabling termination on the backpanel or plane.
Note.
Use active (ANSI SCSI-2 Alternative 2) single-ended ter-
minators when terminating a bus operating in single-
ended mode. Use SPI-2-compliant active low voltage dif-
ferential terminators when terminating a SCSI Ultra2 bus
operating in LVD mode.
Terminator power
ST118202LC drives cannot be configured to provide termination
power.
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Cheetah 18 Installation Guide, Rev. A
47
LC drives
Other applicable jumper options
Other option jumpers are available as illustrated below.
Pin 1
Pin 2
J2
R R R
S D MW P E E
E S E P D S S
E
S
Reserved
Single-Ended Mode option
Use single-ended or low voltage differential mode.
Force the drive to operate only in single-ended mode.
Delay Motor Start option
(valid only if the Enable Motor Start jumper is not connected)
Disable the Delay Motor Start option (default).
Motor start delay equal to the SCSI ID multiplied by 12 seconds.
For example, if the SCSI ID = 2, the drive starts in 24 seconds.
Motor Start option
Disable motor start (default). The drive starts according to the
Delay Motor Start option.
Enable motor start. The drive waits for the Start Unit command
from the host before starting the spindle motor.
Write Protect option
Write protect = Off (enables writing – default).
Write protect = On (disables writing).
Parity Check option
Enable parity check of SCSI bus (default).
Disable parity check.
J2
J6
Drive
Front
J2 Jumper Plug
(enlarged to
show detail)
Figure 17. Additional jumper options
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48
Cheetah 18 Installation Guide, Rev. A
LC drives
Drive Active indiWcaCt/oDrC drives section
The drive Active LED indicator connections are shown below.
Drive
Front
Jumper Plug
(enlarged to
show detail)
Pin 1
J6
Reserved
Activity LED
Reserved
CATH
The shaded pins are shipped
with a cover installed. Do not
install jumpers on these pins.
Retain the cover unless you
install a 20-pin plug.
Note: On some LEDs the flat
side of indicator is cathode.
Figure 18. Drive Active LED indicator connections
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Seagate Technology, Inc.
920 Disc Drive, Scotts Valley, CA 95066-4544, USA
Publication Number: 83329250, Rev. A, Printed in USA
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