Steps for installing a ten 2.5-inch hot-swap-drive backplane
a.
Align the backplane with the slots on the chassis.
b.
Carefully lower the hard disk drive backplane until it is fully seated in the chassis.
Figure 133. Ten 2.5-inch hot-swap-drive backplane installation
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Lenovo System x3550 M5 Installation and Service Guide
Ten 2.5-inch hot-swap-drive backplane