Dell Precision T5400 (Late 2007) - Manual (Page 35)

About Your Computer 35
13 If you had a hard drive installed in the 5.25-inch bay and you are changing
from a desktop to a tower configuration, remove the hard drive from the
drive carrier and install four screws into the front four holes on the sides of
the heard drive.
If you had a hard drive installed in the FlexBay and you are changing from
a tower to a desktop configuration, remove its four screws and install the
hard drive into the drive carrier (see "Hard Drive" on page 212).
NOTE: Hard-drive screws or a hard-drive carrier can be ordered from Dell. See
"Contacting Dell" on page 295.
14 If metal shields are present in your computer (see "About the Metal
Shields Present in Some Drive Configurations" on page 207), replace metal
shields in any empty optical drive bays or over the FlexBay, in tower mode
only, by pressing them into place.
15 If a vented metal insert was installed over the FlexBay and you are
converting from tower to desktop mode, reinstall it:
a Holding the metal insert at an angle, insert its two upper screws into
the slot that runs along the inside of the FlexBay.
b Rotate the bottom of the vented metal insert down and insert its two
bottom screws into the slot in the open area beneath the FlexBay.
c Push the vented metal insert until it clicks into place and its metal
tabs rest flush against the chassis surface.