Compaq 243850-002 User Manual

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Hardware Reference Guide
B–1
B
Hard Drive Installation Guidelines
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 drive employs a 
cable-select feature that identifies the drive as device 0 (primary 
drive) or device 1 (secondary drive).
Device 1 is the drive connected to the cable’s middle connector. 
Device 0 is the drive connected to the cable’s end connector (applies 
only to 80-conductor ATA cables). See “Guidelines for Installing 
Ultra ATA Devices” in this appendix for an example of an Ultra 
ATA cable.
Compaq hard drives ship with jumpers preset to cable-select mode; 
therefore, no jumper setting changes on the existing or optional drives 
are required. If you purchase a third-party hard drive, refer to the 
documentation included with the kit to ensure proper installation and 
configuration of cables.
If installing a second device on the primary controller, you must use 
an 80-conductor Ultra ATA cable for optimal performance. This cable 
is standard on select models.