Seagate ST318451LW Installationsanleitung PDF herunterladen

Cheetah X15 Installation Guide

ST318451LW/LC and ST39251LC

SCSI interface disc drives

Publication Number: 83329485, Rev. B, September 2000

Handling precautions/Electrostatic discharge protection

• Disc drives are fragile. Do not drop or jar the drive and handle the drive

only by the edges or frame.

• Drive electronics are extremely sensitive to static electricity. Keep the

drive in its antistatic container until you are ready to install it. Wear a wrist

strap and cable connected to ground. Discharge static from all items near

or that will contact the drive. Never use an ohmmeter on any circuit

boards.

• Turn off the power to the host system during installation.

• Always use forced-air ventilation when operating the drive.

• Use caution when troubleshooting a unit that has voltages present.

• Do not disassemble the drive; doing so voids the warranty.

• Return the entire drive for depot service if any part is defective.

• Do not apply pressure or attach labels to circuit board or drive top.

Electromagnetic compliance

See Safety and Regulatory Agency Specifications, p/n 75789512.

Drive characteristics

ST318451

Formatted capacity ....................................18.35 Gbytes

Max. data blocks .......................................35,843,670 (0222EE56h)

Cylinders and heads (user accessible)......10,377 / 10 heads

Disc rotation...............................................15k rpm

Operating voltages +5V +12V

Typical operating current.........................0.8A 1.03A

ST39251

Formatted capacity ....................................9.2 Gbytes

Max. data blocks .......................................17,921,835 (0111772Bh)

Cylinders and heads (user accessible)......10,377 / 5 heads

Disc rotation...............................................15k rpm

Operating voltages +5V +12V

Typical operating current.........................0.79A 0.93A

What you need

• Phillips screwdriver and four 6-32 UNC drive mounting screws

• Forced-air ventilation to provide adequate drive cooling

• An unused drive power connector (not applicable to LC models)

To operate at LVD transfer rates, you may also need an LVD-capable SCSI

host adapter, LVD I/O cable and active negation external terminator

Multimode interface

This drive can operate in single-ended (SE) or low voltage differential (LVD)

mode. This multimode capability provides backwards compatibility so you

can use it with or without an LVD-capable host adapter. The primary bene-

fits of LVD technology include faster transfer rates, reduced power con-

sumption, increased allowable cable lengths, and improved device

connectivity.

You can configure the drive to switch between SE and LVD modes automat-

ically or force it to operate in SE mode only. To configure this option, see

Figure 2.

Note.

To operate at the Ultra2 rates in LVD mode, all devices on the same

bus (cable) must be running in LVD mode. If you add any SE device

to the bus, all devices on that bus operate in SE mode.

Note.

Some LVD host adapters provide an LVD connector and an SE con-

nector on the same host adapter to allow you to run SE and LVD

drives concurrently at their maximum capabilities. Check your SCSI

host adapter documentation. See Figure 3.

Caution.

Do not mix LVD drives on the same bus with high voltage differen-

tial (HVD) devices–drive damage may occur.

Installation instructions

1. Set the SCSI ID

Determine which SCSI IDs are already being used in the system and then

assign this disc drive a SCSI ID that isn’t already being used. Use the J6

connector located on the front of the drive to set the SCSI ID (see Figure 1).

• Most Cheetah X15 drives are factory set with the SCSI ID set at 0. If this

is the only SCSI drive in your system and there are no other SCSI

devices on the daisychain, you can leave this drive’s SCSI ID set to 0 and

proceed to the next step.

• The host system’s SCSI controller usually uses SCSI ID 7.

• If you have an LC model drive, the host normally sets the ID over the I/O

interface, so you don’t need to worry about this step.

• Some systems provide a cable designed to connect to the J5 jumper

block on the drive to remotely set the ID. You can connect this cable to J5

and use the host-provided remote switch to set the SCSI ID.

Figure 1. Setting the SCSI ID

2. Configure termination

If you are installing the drive in a system that has other SCSI devices

installed, terminate only the end devices on the SCSI bus (cable). This drive

does not have internal terminators or any other way of adding internal termi-

nation on the drive. You must provide external termination when termination

is required. This is normally done by adding an inline terminator on the end

of the cable. See Figure 3 for an illustration showing a system configuration

that uses a external terminator.

• Use active (ANSI SCSI-2 Alternative 2) single-ended terminators when

terminating a bus operating in single-ended mode.

• Use SPI-2-compliant active low voltage differential terminators when ter-

minating a SCSI Ultra2 bus operating in LVD mode.

• The host adapter is normally on the end of the bus and internally termi-

nated. You can configure your bus with another device on the end if you

remove termination from the host adapter.

3. Configure terminator power

Terminators have to get power from some source. The default configuration

results in the drive not supplying termination power to the bus. You should

normally leave this drive set at this default unless your host system requires

the drive to supply termination power to the bus. To configure this drive to

supply termination power to the bus, place a jumper on J2 pins 1 and 2 as

shown in Figure 2.

• Host systems designed to use LC drives normally provide termination

power from the host adapter or other source. For this reason, LC model

drives cannot be configured to provide termination power to the bus.

SCSI ID = 0 (default)

Jumper Plug

(enlarged to

show detail)

Drive

Front

Pin 1

Reserved

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

DC Power

68 Pin

SCSI I/O

Connector

Drive HDA

Rear

SCSI ID = 8

SCSI ID = 9

SCSI ID = 10

SCSI ID = 11

SCSI ID = 12

SCSI ID = 13

SCSI ID = 14

SCSI ID = 15

not used

SCSI ID = 0

SCSI ID = 1

SCSI ID = 2

SCSI ID = 3

SCSI ID = 4

SCSI ID = 5

SCSI ID = 6

SCSI ID = 7

Pin 1

4P 3P 2P 1P

PCBA

Pin 1

+5V

Ground

(default)

1 2

Inhaltsverzeichnis

Seite 1 - Figure 1. Setting the SCSI ID

Cheetah X15 Installation GuideST318451LW/LC and ST39251LCSCSI interface disc drivesPublication Number: 83329485, Rev. B, September 2000Handling precau

Seite 2 - Reserved

Figure 2. Option select jumpers.4. Connect the drive activity LED (optional)Connect the Drive Activity LED cable to J6 pins 11 and 12 (see Figure 2)

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