HP StorageWorks MSL8096 Tape Library getting started guide (AH218-96002, March 2007)

Slide the tape drive into the bay until it is firmly seated,
and then secure it by tightening the blue thumb screws.
With the tape drive upgrade kits, the Tape Library can
hold up to four tape drives.
Locate the next higher tape drive bay, which will be
directly above a full-height drive or above a half-height
drive/half-height cover pair, in one of the locations
shown.
Remove one cover for a half-height drive or two covers
for a full-height drive.
Optional: Adding tape drives
With the redundant power supply upgrade kit, the Tape
Library will continue to operate without interruption if
either power supply fails.
To install the redundant power supply, remove the cover
plate for the redundant power supply, slide the power
supply into the bay until it is firmly seated, and then
secure it by tightening the blue thumb screws.
Optional: Adding a redundant
power supply