Asus AP1720-E2 - Manual (Page 40)

Chapter 2: Hardware setup 2-20
5. Place a SATA or an SCA SCSI
hard disk to the drive tray, and
secure it with four screws.
6. Carefully insert drive tray and
push it all the way to the depth of
the bay until just a small fraction
of the tray edge protrudes.
7. Push the tray lever until it clicks,
and secures the drive tray in
place. The drive tray is correctly
placed when its front edge aligns
with the bay edge.