Dell Precision 490 Desktop User Manual page 63

7. If the CD/DVD drive bay is unpopulated and metal shields are present in your computer (see
Configurations), pull to remove the 5.25-inch metal shield.
Then, remove the drive-panel insert from a 5.25-inch drive bay (see
8. Flex the hard-drive bracket open and align the side holes in the hard drive with the plastic pins on the bracket; release the tension upon the bracket so
that the hard drive is securely fastened.
1 hard drive
2 hard-drive bracket
9. Slide the hard drive in the hard-drive bracket into the hard-drive carrier.
1 hard-drive carrier
2 SATA hard drive in hard-drive bracket
10. Slide the hard-drive carrier into the 5.25-inch drive bay until it is securely seated.
1 desktop drive-retention insert
2 optional third SATA hard drive in hard-drive carrier
11. Replace the desktop drive retention insert and fold down its handle.
12. Connect a power cable to the hard drive.
About the Metal Shields Present in Some Drive
Removing a Drive-Panel Insert).