Apple powermac server g3 minitow サービスマニュアル
Basics
Data Buses - 15
All devices on the same SCSI bus must have unique ID
numbers, but devices on different SCSI buses may use the
same SCSI ID number. (For example, you could have a
removable media drive with ID number 3 connected to the
Narrow SCSI-1 bus and a hard drive with ID number 3
connected to the Ultra Wide SCSI-3 bus.)
Some of the drives that were installed at the factory, as well
as the SCSI card itself, have already reserved certain SCSI
ID numbers on the Ultra Wide SCSI-3 bus. Other ID
numbers are available for assignment to SCSI devices that
are added later.
The following table provides more information on assigning
SCSI ID numbers to Ultra Wide devices.