Dell PowerEdge 6400 Manual page 8

6 SCSI Backplane Option
18. To remove the upper drive bay key, remove the three screws.
19. To remove the lower drive key, remove the three screws securing the key to the
chassis.
20. Rotate each drive bay key so that the "6" or "8" stamped on the end of each key
faces forward and matches the drive capacity of the new backplane (see
Figure 5).
1 Key stamp
2 Lower drive bay key
3 Upper drive bay key
21. Reinstall the lower drive key using the three screws.
22. To reinstall the upper drive key, lock the drive-locking flange and reinstall the three
screws through the flange cutouts.