Appendix C Hard Drives; Device 0/Device 1 Relationship; Cable Select - Compaq DESKPRO 2000 SERIES Maintenance & Service Manual

C
appendix
H D
ARD RIVES
Compaq Computer Corporation uses IDE hard disk drives that conform to two different
primary/secondary implementations. These are Conner mode and ATA-compatible
mode. These two modes are incompatible with one another.

Device 0/Device 1 Relationship

A device 0/device 1 relationship exists when there are two hard drives connected to a
single port. In this situation, one drive must be designated as the device 0, or primary,
drive and the other as the device 1, or secondary, drive. This designation is necessary
because both drives cannot work simultaneously.

Cable Select

The Compaq Deskpro 2000 Series of Personal Computers use cable-select technology
for identifying Device 0 (primary) and Device 1 (secondary) IDE hard drives. Check
that the jumpers on the IDE hard drive are set properly for cable-select installation.
Always check the label on the drives or check Chapter 6 of this manual when a new
drive is added to verify that the jumper settings are set correctly.
Cable select may not function properly if drives other than those supported by
Compaq are installed.
The second drive on a cable-select cable can be a CD-ROM drive. However, the
CD-ROM drive must be installed in the device 1 position if a hard drive is installed
on the same cable. Ensure that both drives are set for cable-select configuration.
See Chapter 6 for more information.
If two drives are already connected to the primary IDE controller and an additional
drive is to be installed, the secondary IDE controller must be enabled. The
secondary IDE controller can be enabled by checking this option after opening the
Advanced box in the Mass Storage group of F10 Computer Setup. See Chapter 7
for more information.
When more than two drives are installed, drive performances are best when the
two faster drives are connected to the primary IDE controller and the slower drive
is connected to the secondary IDE controller.
A hard drive is installed and configured more quickly when it has first been
formatted.
If your new drive includes the cable select feature, no jumper setting changes are
required. Refer to the documentation supplied with the cable for instructions on
using the cable select feature. If you install a third-party hard drive, you will need
to purchase a jumper cable (spare part number 247568-001) from Compaq
Computer Corporation.
Compaq Deskpro 2000 C - 1