Compaq Evo D500 Hardware Reference Manual page 22

Adding System Memory and Upgrading the Internal Hard Drive
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3–8
5. Disconnect the flat ribbon data cable 1 from the hard drive by
pulling up on the green tab on the cable end.
6. Disconnect the power cable 2 from the hard drive by pulling up
on the connector.
When removing cables, pull on the tab or connector instead of the
cable itself. This will help prevent cable damage.
7. Transfer the four screws from the old drive to the new one. The
screws take the place of drive rails.
8. Connect the flat ribbon data cable 1 and power cable 2 to the
new hard drive.
9. Gently slide the hard drive into the drive cage until the release
lever catches and secures it.
10. Replace the access panel.
Hardware Reference Guide