Hardware Reference Guide
C-3
Compaq Confidential - Need to Know Required
Writer:
Lydia Sanchez
Part Number:
123456-001
File Name:
appc.doc
Last Saved On:
04/11/00 5:36 PM
Last Saved By:
Lydia Sanchez
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Connect an external SCSI device with its termination enabled
to the external SCSI connector on the rear panel of the
computer.
■
Turn on all external SCSI devices before turning on the power to
the computer. This enables the SCSI controller to recognize the
external devices.
■
All SCSI hard drives must be either internal or external, but never
both. The system accommodates a combination of other internal
and external SCSI devices, such as tape and CD-ROM drives.
■
Compaq does not recommend mixing different width SCSI devices
on the same SCSI chain or on the same SCSI controller. Mixing
devices of different widths on the same chain or controller will
always result in a data transfer rate of the slowest machine in that
chain. It is acceptable to mix Wide-Ultra2 and Ultra3 SCSI
devices, but do not mix Narrow devices with any devices other
than Narrow devices.
For additional information about optional SCSI devices, refer to the
documentation included with the device or contact your Compaq
authorized dealer, reseller, or service provider.
CAUTION:
Do not route cables near the air intake to the power
supply. Cables routed in this manner can block airflow to the power
supply, causing it to overheat.
Guidelines for Installing a SCSI Device
Compaq does not support mixing Ultra ATA and SCSI hard drives in
the same system.
On a Compaq Deskpro Workstation AP250, if you are replacing a hard
drive in bays 4 or 5, the replacement drive should be of the same type
as the drive being removed. If you are replacing the Ultra ATA hard
drive with a SCSI hard drive, you will need a SCSI device option kit
and the SCSI controller option kit. The controller option kit contains
the SCSI controller and a cable that supports multiple SCSI devices.
Before installing a SCSI device on any workstation:
■
Verify the SCSI ID of the drive and, if necessary, set the SCSI ID
to a unique number. See Guidelines for SCSI Devices in this
appendix or refer to the documentation included with the device.
■
Determine if the device requires termination to be enabled or
disabled. Set the termination if necessary. See the section Using a
SCSI Cable or refer to the documentation included with the
device.
