Compaq Deskpro 2000 Series of Personal Computers
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appendix
C
H
ARD
D
RIVES
Compaq Computer Corporation uses IDE/EIDE 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 (primary) drive and the other as the device
1 (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/EIDE hard drives. Check that the jumpers on the
IDE/EIDE hard drives are set properly for cable-select installation. Always check the label on the
drives or check Chapter 7 of this manual when a new drive is added to verify that the jumper settings
are set correctly.
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Cable select may not function properly if drives other than those supported by Compaq are
installed.
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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 7 for more information.
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If two drives are already connected to the primary IDE/EIDE controller and an additional drive is
to be installed, the secondary IDE/EIDE controller must be enabled. The secondary IDE/EIDE
controller can be enabled by checking this option after opening the Advanced box in the Mass
Storage group of F10 Computer Setup. See Chapter 2 for more information.
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When more than two drives are installed, drive performances are best when the two faster drives
are connected to the primary IDE/EIDE controller and the slower drive is connected to the
secondary IDE/EIDE controller.
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A hard drive is installed and configured more quickly when the jumpers have been configured
first.
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If the new drive includes the cable-select feature, no jumper setting changes are required. Refer to
the documentation supplied with the drive 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.
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