Dell OptiPlex NX1 - Manual (Page 127)

Removing and Replacing Parts on the Mini Tower Chassis 6-11
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To remove a 3.5-inch diskette drive assembly, follow these steps:
1. Disconnect the DC power cable and the interface cable from the back of
the 3.5-inch diskette drive.
2. Press the retaining-tab release button, and pull the drive assembly forward
to remove it.
3. Remove the drive-mounting screw from the left side of the drive, and
remove the drive from the bracket (see Figure 6-10).
retaining-tab
release button