Dell XPS 8500 (Early 2012) - Manual (Page 63)

Hard Drive Cage
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.
Removing the Hard Drive Cage
1 If applicable, disconnect the power and data cables from the secondary
hard-drive.
2 Remove the screws that secure the hard drive cage to the chassis.
3 Slide the hard drive cage towards the back of the chassis.
Hard Drive(s) 63