Western Digital WD Caviar Installation Manual page 11

If installing your new Western Digital hard drive with a
non-Western Digital hard drive, obtain jumper configuration
information from your original drive manufacturer. Refer to
page 38 for the phone numbers and internet addresses of other
hard drive manufacturers.
Step 2. Mounting Hardware
Inspect the bay to see whether it is a 3.5-inch or 5.25-inch bay.
The Western Digital hard drive fits in a 3.5-inch bay. If you are
installing the Western Digital hard drive in a 5.25-inch bay, you
must install the 5.25-inch mounting hardware. Refer to the
following illustration.
Mounting Hardware for a 5-25-inch Bay
Step 3. Drive Rails (optional)
In a 5.25-inch drive bay, rails are sometimes necessary to
complete installation. Consult your system manufacturer.
Hardware Installation 7