Gateway GT4015 Hardware Reference Manual page 24

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Remove the hard drive bay screw.
6
Remove the hard drive bay from your computer. You may need to work
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the bay out of your computer by rocking the bay back and forth. If you
are adding a new drive, go to
Remove the four screws that secure the hard drive to the hard drive bay,
8
then remove the hard drive from the bay.
Screws
Adding or replacing a hard drive
Step 10.
Screws
Hard drive
bay screw
21