Dell Precision T5400 (Late 2007) - Manual (Page 219)

Adding and Replacing Parts 219
NOTICE: If metal shields are present in your computer configuration, they must be
installed at all times while your computer is in use or your computer may not
function properly.
5 If metal shields are present in your computer (see "About the Metal
Shields Present in Some Drive Configurations" on page 207)
slide the sliding-plate lever to the right and hold it in place as you pull to
remove the vented metal insert from the FlexBay.
6 Disconnect the power cable from the back of the hard drive.
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