Compaq 500B Microtower Supplementary Manual page 26

6 Pull each of the three side tabs that secure the front
bezel to the computer, to release the front bezel.
7 Swing the front bezel out to remove from the computer.
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8 Locate the external drive bay at the front of the
computer, below the optical drive bays.
9 Disconnect the power (1) and data (2) cables by
squeezing the latch on the connector and pulling to
remove.
Removing and Replacing a Hard Disk Drive