My XBOX DVD drive was slowly going bad, so I decided to replace it. Figured it would give me something to do while I search for a 360.
Step 1: Open the case
There are 6 #20 Torx screws on the bottom of the case. Each is hidden under stickers or the padded feet on the case.
Step 2: Take out the old drive
To remove the old drive, simply remove 2 #10 Torx screws from the plastic bracket attached to the DVD drive. Then, push in the plastic tab (noted above) and gently pull up on the drive.
The drive is connected to the XBOX with an IDE cable and a power cable. Disconnect both.
Step 3: Remove old drive faceplate and place on new drive
The XBOX DVD drives have a plastic faceplate. You will need to remove the faceplate from the old drive by pulling out slightly then up.
The process for adding the faceplate to the new drive is the reverse. Slide the faceplate down from the top of the drive door.
Step 4: Place new drive in the case
Adding the new drive is the same as removing the old drive... but in reverse. Attach the IDE and power cables securely, then slip the drive into place. You should hear a click when the bracket snaps into place.
Reattach the 2 #10 Torx screws to secure the drive.
Step 5: Close the case
Reattach all 6 screws in the case and the rubber feet and you're done!