b.
Carefully lower the backplate assembly into the chassis until it is seated firmly.
Figure 143. Four 2.5-inch simple-swap-drive backplate assembly installation
Steps for installing a four 3.5-inch simple-swap-drive backplate assembly
a.
Carefully lower the backplate assembly into the chassis until it is seated firmly.
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Lenovo System x3550 M5 Installation and Service Guide
Four 2.5-inch simple-swap-drive backplate