Yamaha CRW2100S - CRW - CD-RW Drive Owner's Manual page 34

Setup Procedures
5 Remove the four screws holding the CD-ROM drive in place, then
slide the drive forward and out from the drive bay.
Slide the CRW2100S drive backwards into the now-vacant bay without
applying excessive force.
CD-ROM drive
6 Leave enough room behind the drive for connecting the power, SCSI
and audio cables. Then tighten the four fastening screws on the
sides of the unit by hand to hold the drive in place.
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CRW2100S