Dell Precision 3930 Rack Service Manual page 29

NOTE: Ensure that the release latch [2], is open while inserting the had drive back into the slot.
3 To Install the hard drive blank if slot is not occupied by a hard drive:
a Insert the hard drive blank into the hard drive slot and slide it in.
4 Follow the procedure in
NOTE: All hard drive slots should be populated with either a hard drive assembly or hard drive blank to ensure proper system
cooling and air flow.
After working inside your computer.
Removing and installing components 29