Lenovo System x3550 M5 Installation And Service Manual page 230

Steps for installing a four 3.5-inch hot-swap-drive backplane
a. Carefully lower the hard disk drive backplane until it is fully seated in the chassis.
b. Secure the backplane to the chassis by pressing the release latches.
Figure 135. Four 3.5-inch hot-swap-drive backplane installation
Step 4. Route the signal cable from the drive backplane along the chassis and connect it to the SAS/SATA
controller connectors. Then, route the power cable and the configuration cable from the drive
backplane along the chassis and connect it to the SAS/SATA power connector and SAS/SATA
configuration connector. For the 10 x 2.5-inch drive backplane with two NVMe connectors, connect
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Lenovo System x3550 M5 Installation and Service Guide
Four 3.5-inch hot-swap-drive backplane