Dell PowerEdge T610 Hardware Owner's Manual page 110

Each device attached to a SCSI host adapter must have a unique
a
SCSI ID number (narrow SCSI devices use IDs 0 to 7; wide SCSI
devices use IDs from 0 to 15). Set the drive's SCSI ID to avoid
conflicts with other devices on the SCSI bus. For the default SCSI ID
setting, see the documentation provided with the drive.
NOTE:
sequentially or that devices be attached to the cable in order by ID number.
SCSI logic requires that the two devices at opposite ends of a SCSI
b
chain be terminated and that all devices in between be unterminated.
Enable the tape drive's termination if it is the last device in a chain of
devices (or sole device) connected to the SCSI controller.
2 Turn off the system and attached peripherals, and disconnect the system
from the electrical outlet and peripherals.
3 Open the system. See "Opening the System."
4 Remove the expansion card stabilizer. See "Removing the Expansion Card
Stabilizer."
5 Remove the cooling shroud. See "Removing the Cooling Shroud."
6 To remove an old drive or drive blank, slide the drive release latch in the
direction of the arrow to release the shoulder screws, and slide the drive or
drive blank out to remove it from the drive bay. See Figure 3-15.
7 Remove the three shoulder screws from the old drive or the drive blank.
See Figure 3-16.
8 On the new drive, attach one of the shoulder screws to the top row of holes
and two to the bottom row of holes. See Figure 3-16.
110
Installing System Components
There is no requirement that SCSI ID numbers be assigned