120
 Bays 1, 2, 3 (3.5-In. and 5.25-In. Internal/External Bays)
•
Disconnect all cables on the drive (note location of cables).
•
Remove  the screws.
WARNING: 
 For 5.25-In. hard disk drive installation,  it uses different screws 
from 3.5-In. hard disk drive .
IMPORTANT: 
 Install the 3.5-in. hard disk drive only in bays 1,2 and 3 using the 
drive tray to keep it in place. Remember to use rubber cushion to avoid 
acoustic problem.
•
Pull out the drive.