A–6 Technical Reference Guide
Ultra ATA / IDE Guidelines
Example 2: Four Device Installation Sample
A system has four devices: Ultra ATA-133 hard drive, Ultra ATA-133 hard drive, DVD-CDR/W
drive, and a ZIP-250 drive. Using the Device Class Table in Section 4.3.1, the devices may be
reidentified as:
■ Ultra ATA-133 hard drive = Class 1
■ Ultra ATA-133 hard drive = Class 1
■ DVD-CDR/W drive = Class 2
■ ZIP-250 drive = Class 4
*If there are three or more devices, two or more of which are hard drives, two hard drives should
be attached to the primary controller first before following the General Attach Sequence Rule.
Additional Drive Application Notes
■ When replacing a hard drive, the replacement should be of the same type (Ultra ATA-33, -66,
-100, or -133) as that being removed to retain the same level of performance.
■ When Ultra ATA and SCSI hard drives are mixed in the same system, the Ultra ATA drive
will become the boot drive unless the boot order is changed.
Attach Sequence Worksheet – Four Device Installation (Sample)
device name
device
class
position
number
controller
name
device
number
Ultra ATA-133 hard drive 1 1 Primary 0
DVD-CDR/W drive 2 2 Secondary 0
ZIP-250 drive 4 3 Secondary 1
Ultra ATA-133 hard drive* 1 4 Primary 1
1
2
4
3
Primary
Controller*
41
Secondary
Controller
32
Device 1 Device 0
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