Dell Precision WorkStation 420 Service Manual page 12

CAUTION: Before you remove the computer cover, see
1. Remove the four screws that secure the hard-disk drive to the drive bracket.
Retain these screws; they will be needed for the replacement drive.
2. Remove the hard-disk drive.
Hard-Disk Drive Replacement
To install a replacement hard-disk drive, perform the following steps.
CAUTION: Before you remove the computer cover, see
1. If you are replacing a hard-disk drive that contains data you want to keep, be sure you have a backup of your files before you begin this
procedure.
2. Prepare the replacement drive for installation.
NOTICE: Wear a wrist grounding strap or ground yourself by touching an unpainted metal surface on the back of the
computer.
NOTICE: When you unpack the drive, do not set it on a hard surface, which may damage the drive. Instead, set the drive
on a surface such as a foam pad that will sufficiently cushion it.
Check the documentation for the drive to verify that it is configured for your computer system.
3. Remove the computer cover as instructed in
4. Remove the drive bracket from the chassis as instructed in
5. Slide the drive into the chosen bay of the bracket, oriented so that the connectors on the back of the drive will face the back of the chassis
when the bracket is reinstalled (see Figure 16).
6. Align the four screw holes of the drive and bracket. Insert and tighten the screws (see Figure 17).
Figure 17. Installing a Hard-Disk Drive in the Bracket
7. Reinstall the hard-disk drive bracket in the chassis (see Figure 18).
Install the bracket into the chassis by inserting the hooks in the slots on the front of the chassis. Then lower the bracket to the bottom of the
chassis, making sure that the latch on the drive bay is engaged. Replace the screw holding the drive bracket to the drive bay.
Figure 18. Installing the Drive Bracket in the Chassis
"Precautionary
"Precautionary
"Computer Cover."
"Hard-Disk Drive Bracket
1 Screws (4)
2 Drive bracket
3 Drive
Measures."
Measures."
Removal."