4.2.5 PATA Cable Layout
The faces of industry-standard cable connectors are color-coded for easy recognition:
System board connector = blue face
Device 0 connector = black face
Device 1 connector = gray face
The color code of an industry-standard cable is applicable only if the drive's jumper is in the
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
Some cables may be labeled "Drive 0" instead of "Device 0" and "Drive 1" instead of
4.3 PATA Drive Installation Guidelines
Most computer system boards have two ATA (IDE) channels with a dedicated connector for each
channel. One channel is designated as the primary and the other as the secondary channel.
Each of the two channels can have up to two devices attached to it. Each computer system may
therefore have a maximum of four ATA/ATAPI drives. All drives are connected to these channels
using an industry-standard 80-conductor cable.
The industry standard 1.44 MB diskette drive has its own separate channel and is not included as
a part of the maximum four drives.
Service Reference Guide, d500
Serial and Parallel ATA Drive Guidelines and Features