Lenovo System x3550 M4 Installation And Service Manual page 278

Step 5. Slide the blue release tab to the right with one finger while using another finger to grasp the black
drive handle and pull the hard disk drives out of the server slightly to disengage them from the hard
disk drive backplate (see "Removing simple-swap hard disk drives" on page 205).
Step 6. Remove the simple-swap hard disk drive backplate assembly.If you would like to remove the 3.5-
inch drive backplate assembly.
a. Adjust the latch to the unlocked position on 3.5-inch server models.
Figure 182. Latch adjustment
b. Lift the drive backplate up to disengage the backplate assembly from the backplane bracket
and remove it from the server.
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Lenovo System x3550 M4 Installation and Service Guide