Push the drive back in until it clicks, and use one hand to push it inwards, exposing the three Phillips #00 M2.0x4.0 screws.

Unscrew the three Phillips #00 M2.0x4.0 screws.

When reassembling the computer, remember to replace these screws before replacing the black plastic faceplate for the disk drive.

If you need to reopen the drive, use a paper clip in the same hole as used before.