Gateway GM5407H Reference Manual page 56

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CHAPTER 4: Upgrading Your Computer
Loosen the captive thumbscrew that secures the hard
drive cage to the computer. (This screw cannot be
removed.)
Remove the hard drive cage from the computer.
If you are replacing a drive, remove the screws that
secure the hard drive to the hard drive cage, then slide
the old hard drive out of the cage.
Hard drive screws (top)
Hard drive screws (top)
If you are replacing a drive, note any jumper settings
on the old drive and set the jumper on the new drive
to be the same.
- OR -
If you are adding a new drive, set the jumper as
instructed by the drive's user guide.
Slide the new hard drive into the cage, then secure it
to the cage using either the four screws you removed
previously or mounting screws provided with your new
drive.
Hard drive screws (bottom)
Hard drive screws (bottom)