Specifications

SCSI ID Numbers
Each SCSI device must have a SCSI ID number, from 0 to 7. The
factory set SCSI ID number for the adapter card is 7.
You must assign a unique ID number between 0 and 6 to each
additional SCSI device that you install. The SCSI ID number is
determined by jumper or switch settings on the SCSI device. The
documentation that comes with each SCSI device includes specific
jumper and/or switch instructions.
SCSI ID 0 is reserved for the hard disk from which you start the
system. SCSI ID 1 is reserved for a second hard disk.
Each SCSI ID also has a logical unit number (LUN) associated
with it. This number can be from 0 to 7; however, the LUN for
most devices is fixed at 0.
The address of a SCSI device consists of the Target number and
the LUN. The following table shows the typical SCSI addressing
assignments.
Target:LUN Device
0:0
l:0
First SCSI hard disk drive
Second SCSI hard disk drive
2:0-7
Any SCSI device
3:0-7 Any SCSI device
4:0-7
Any SCSI device
5:0-7
Any SCSI device
6:0-7
Any SCSI device
7 SCSI adapter card
1-2
The SCSI In terface