Dell PowerEdge 6400 Manual page 9

23. Replace the front bezel and computer cover.
24. Reinstall the hard-disk drives in the computer.
NOTE: You can use only 1-inch hard-disk drives with an 8-bay backplane—you cannot
use 1.6-inch hard-disk drives. (A 6-bay backplane can accommodate 1.6-inch or 1-inch
drives.) If you install an 8-bay backplane, you need to convert the drive carriers to the
1-inch width by removing the spacer insert that fastens to each carrier adjacent to the
carrier release handle.
25. Reconnect the computer and peripherals to their AC power sources.
support.dell.com SCSI Backplane Option 7