Dell XPS 8500 (Early 2012) - Manual (Page 65)

Postrequisites
1 Replace the primary hard-drive. See "Replacing the Primary Hard-Drive"
on page 62.
2 Replace the computer cover. See "Replacing the Computer Cover" on
page 25.
Secondary Hard-Drive
(optional)
Prerequisites
1 Remove the computer cover. See "Removing the Computer Cover" on
page 23.
2 Remove the primary hard-drive. See "Removing the Primary Hard-Drive"
on page 61.
3 Remove the hard drive cage. See "Removing the Hard Drive Cage" on
page 63.
Removing the Secondary Hard-Drive
1 Remove the screws that secure the secondary hard-drive to the hard drive
cage.
2 Slide the secondary hard-drive away from the hard drive cage.
Hard Drive(s) 65