Dell Vostro 400 (Mid 2007) - Manual (Page 130)

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Removing and Installing Parts
7 If removing this drive changes the drive configuration, you will need to
reflect these changes in system setup. When you restart your computer,
enter system setup (see "System Setup" on page 174), then go to the
"Drives" section of the system setup and under Drive 0 through 3, set the
Drive to the correct configuration.
8 Replace the computer cover (see "Replacing the Computer Cover" on
page 166).
9 Connect computer and other devices to an electrical outlet.
Installing a Hard Drive
1 Follow the procedures in "Before You Begin" on page 101.
2 Remove the computer cover (see "Removing the Computer Cover" on
page 103).
3 Check the documentation for the drive to verify that it is configured for
your computer.
4 Slide the hard drive into the hard drive bay.
5 Align the four screw holes in the hard drive with the screw holes in the
hard drive bay.