IBM Aptiva Handbook page 94

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To replace or remove the hard disk drive, do the following:
1.
Make sure to disconnect the power and signal cables
from the CD-ROM drive and the diskette drive.
2.
Pivot the latch that secures the lower drive mounting
tray.
3.
Slide the drive mounting tray toward the rear of the
computer and remove it.
4.
Remove the four screws (two on each side) that hold
the hard disk drive to the mounting tray.
8-10 Chapter 8: Adding and removing adapter cards and drives
5.
Pull the hard disk drive from the mounting tray to
remove it.
6.
Reverse the procedure to install a new drive.