Drive Installation Guidelines; Device Classes - HP xw3100 Service And Technical Reference Manual

Ultra ATA Drive Guidelines and Features
Single-Drive Cable
Two-Drive Cable
On a two-drive cable, the Drive/Device 0 connector is always the farthest one from the system
board connector and the Drive/Device 1 connector is always the closest to the system board
connector.
Some cables may be labeled "Drive 0" instead of "Device 0" and "Drive 1" instead of
"Device 1".

Drive Installation Guidelines

Your workstation supports three drive bays and contains two ATA (IDE) controller channels with
a dedicated connector on the system board for each controller. One controller is designated as the
primary and the other as the secondary. Each controller can have up to two devices attached to it
via an industry-standard 80-conductor cable.
To install a secondary hard drive, you must use a dual-headed cable (PN 108950-051).
Any drive attached to a ATA controller must have a drive designation, such as Device O (Master
Drive) or Device 1 (Slave Drive). Drives set to the cable select mode will automatically be
designated as Device 0 or Device 1 depending on where they are connected on the device cable
and whether or not they are the only drive connected to the cable. For optimal performance of
your system, all drives need to be attached to the primary and secondary ATA controllers in a
specified sequence. This sequence is determined by the device class and by specific attach
sequence rules.

Device Classes

In order to determine the best drive attach sequence, ATA/ATAPI drives are segregated into four
different classes based upon the bandwidth demands they place on an ATA controller. The most
demanding devices are in Class 1 and the least demanding are in Class 4.
G–2
System
Board
Blue
Face
System
Board
Blue
Face
Device 0
(master)
Black
Face
Device 1 Device 0
(slave) (master)
Gray Black
Face Face
Service and Technical Reference Guide, xw3100