Dell OptiPlex E1 Reference And Installation Manual page 114

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If a drive is already installed in the bay and you are replacing it, be sure to discon-
nect the DC power cable and interface cable from the back of the drive before
removing the drive/bracket assembly. To remove the old drive from the bracket,
turn the drive/bracket assembly upside down and unscrew the four screws that
secure the drive to the bracket (see Figure 7-7).
screws (4)
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Turn the drive upside down, and locate the four screw holes around its perimeter.
Fit the bracket over the drive so that the notched end aligns with the front of the
drive. Use the score marks on the drive bracket to help align the screw holes on
the drive with the screw holes on the bracket (see Figure 7-8).
7-6 Dell OptiPlex E1 Managed PC Reference and Installation Guide