Apple Setting Up Your Power Macintosh G4 (PCI & AGP) - Manual (Page 41)

Working Inside the Computer 41
3 Remove the low-profile attachment screw from the drive carrier and tilt the carrier up to
remove it from the computer.
The head of the attachment screw is designed to work specifically with the drive carrier. Set
the screw aside for now; you will use it when you put the carrier back in.
The illustration below shows the rear drive carrier, but this step applies to all the carriers.
Remove the attachment screw
to release the drive carrier.
Tilt the drive carrier up
and carefully pull it out
of the computer.
If drives are installed in
drive positions 1 and 2 and you
want to remove them, you must
remove the drive in position 2 before
you can remove the drive in position 1.