IBM 8202-E4B Manual page 141

Figure 93. Installing the backplane on a rack-mounted model
16. Replace all disk drive units and fillers, if you had removed them earlier.
a. Support the bottom of the disk drive unit as you align it with the guide rails in the backplane.
b. Slide the disk drive unit all the way into the backplane.
c. Push the handle (A) toward the disk drive unit to lock it into place.
Disk drives or solid-state drives
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