IBM RT User's Setup Manual page 227

2-52 Options Installation
7. Facing the front of the unit, release the plastic latches holding
the drive in place and carefully remove the drive from position
E.
8. If the drive is to be reinstalled in drive position C, see
"Installing a Fixed-Disk Drive in Position C" on page 2-13 for
installation of the drive and replacement of the cooling fan.
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