Epson 4000 - Manual (Page 85)

4. Align the hard disk drive so that the cables lead toward the
diskette drive bays and the four screw holes on the base of
the drive are above the four pegs, as shown below.
5. Gently lower the drive over the pegs. When the pegs are
inserted in the screw holes on the base of the hard disk
drive, the drive will not move from side to side.
6. Lower the mounting bracket over the hard disk drive,
making sure that the slots in the mounting bracket fit over
the tabs on the base of the computer.
Installing and Removing Drives
5-9