General Attach Guidelines - HP xw3100 Service And Technical Reference Manual

Class 1
Hard
Drives
ATA-100
ATA-66
ATA-33
The above classifications are used as examples only. Your system may or may not support some
Class 4 drives. A diskette drive is Class 4, however, this drive has an exclusive connector on the
system board and is not considered when "counting" the number of devices allowed on a given
ATA controller. For a hardware compatibility list for your specific system, please refer to
www.hp.com/support.

General Attach Guidelines

The lower the device class number, the faster the device and the more bandwidth required.
Drives installed in the Device 0 positions on both the primary and secondary controllers
receive the greatest possible bandwidth.
The bootable ATA hard drive should always be installed on the primary controller in the
Device 0 position.
Device Attach Sequences
Scenario One: a system has two devices. Using the Device Class Table above, the device class
for each is identified as:
Ultra ATA-100 hard drive = Class 1
DVD-ROM drive = Class 2
Device Name
Ultra ATA-100 hard drive
DVD-ROM drive
Service and Technical Reference Guide, xw3100
Class 2
High Speed
Optical Drives
DVD
DVD-CD R/W
Attach Sequence - Two Device
Device Class
1
2
Ultra ATA Drive Guidelines and Features
Class 3
Optical Storage
Drives
R/W CD-ROM
CD-ROM
Position
Number ATA Controller
Primary
1
Secondary
2
Class 4
Magnetic
Storage Drives
LS-120
Tape
Zip
Diskette
Device
Number
0
0
G–3