Mass Storage Devices; Using The Cable-Select Feature With Ultra Ata Devices - Compaq Deskpro EX User Manual

4.7

Mass Storage Devices

The Compaq Deskpro EX Series of Personal Computers desktop model supports up to
four drives in various configurations.
Reference Configuration
1
2
3
To verify the type and size of the mass storage devices installed in the computer, run
Computer Setup.
When installing additional drives, follow these guidelines:
!
For optimal performance, connect hard drives to the primary controller. Connect
expansion devices, such as CD-ROM, IDE tape, and diskette drives to the
secondary controller.
!
You may install either a third-height or a half-height drive into a half-height bay.

Using the Cable-Select Feature with Ultra ATA Devices

Optional drives are available from Compaq in kits that include a special drive cable. The
configuration of the drives employs a cable-select feature that identifies the drives as
device 0 (primary drive) or device 1 (secondary drive). The system board determines
which drive is device 0 or device 1, based on the way the drives are connected to the
special drive cable. The device 0 drive is the drive connected to the short segment of the
drive cable (or that connector closest to the system board); the device 1 drive is the drive
connected to the long segment of the drive cable.
Drive installation requires no jumper setting changes on the existing or optional drives.
All Compaq drives have the jumpers preset for cable-select installation.
If installing a second device on the primary controller, you must use an
80-conductor Ultra ATA cable for optimal performance. This cable is
available as a Compaq option.
Two standard 5.25-inch, half-height bays for optional drives
One standard 3.5-inch, 1.44-MB diskette drive
One standard 3.5-inch, side-mounted hard drive
Compaq Deskpro EX Series of Personal Computers 4-7