IBM System x3550 M5 Type 5463 Installation And Service Manual page 218

Figure 118. 10 x 2.5-inch hot-swap hard disk drive backplane removal
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IBM System x3550 M5 Type 5463: Installation and Service Guide
a. Carefully lift the backplane out of the chassis by pulling outwards and
lifting it up.
Steps for removing a 4 x 3.5-inch hot-swap hard disk drive backplane.
a. Lift the release latches that secures the backplane to the chassis.
b. Carefully lift the backplane out of the chassis by pulling outwards and
lifting it up.
10 x 2.5-inch hard disk drive backplane