IBM RT User's Setup Manual page 223

7. Facing the rear of the unit, release the plastic latches holding
the drive in place and carefully remove the drive from position
C.
(
(
A.IZIF087
8. If the drive is to be reinstalled in drive position II, see
"Installing a Fixed-Disk Drive in Position F" on page 2-35 for
installation of the drive and the replacement of the cooling fan.
2-48 Options Installation