HP CD-Writer Plus Internal 9200i Drive - Manual (Page 6)

6 How to Set the SCSI ID
The SCSI Card
A SCSI card (not included) and its software must be installed and
functioning properly before installing the new drive. Consult the
documentation that came with your SCSI card or your computer for
details.
If you purchase a SCSI card (also known as a host adapter or SCSI board)
for your computer make sure it is:
■ PCI Bus
■ SCSI-2
The SCSI Devices
SCSI IDs
Each device in a SCSI chain must have a different identifying number
between 0 and 7 called the SCSI ID (SCSI ID 7 is usually reserved for the
SCSI card). The SCSI ID for internal devices is often set by placing or
removing small caps called jumpers over pairs of pins on the back of the
device.
Termination
The SCSI devices at either end of a chain must be terminated so the
computer knows that there are no more devices in the chain. Internal
devices are often terminated by placing a jumper on the device’s
termination pins.
If you do not have any external devices, the SCSI card itself is one end of
the chain and must be terminated. Most newer SCSI cards adjust their
termination automatically.
How to Set the SCSI ID
Why might I need to change the SCSI ID?
A SCSI card may have several devices attached to form a SCSI chain. Each
device in the chain must have a different SCSI ID. You will need to
change the SCSI ID on the HP drive if the ID set at the factory is already
in use by another device.