Dell Dimension XPS R Series Service Manual page 55

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To reinstall the primary hard-disk drive, be sure that the drive's circuit board is
positioned toward the front of the chassis.
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.
primary hard-disk drive
card guide assembly
drive-assembly
mounting screws (2)
Removing and Replacing Parts 4-11