Dell Dimension XPS R Series Service Manual page 57

secondary
hard-disk drive
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When you replace a hard-disk drive, be sure to set the jumpers on the replace-
ment drive the same as the jumpers on the drive you removed. For additional
information about jumper settings on EIDE drives, see "EIDE Subsystem" in
Chapter 1.
When you insert the replacement hard-disk drive into the drive bracket, be sure
that the two tabs on the bracket fit into the mounting holes on the side of the
drive.
screw
drive bracket
tabs (2)
Removing and Replacing Parts 4-13