Dell XPS 730 H2C (Late 2008) - Manual (Page 19)

2.5" hard drive:
Removal:
Replacement:
6. Verify that the hard drive bay is empty and unobstructed.
7. Slide the hard drive into the hard drive bay until it clicks securely into place.
1 hard drive 2 hard drive bracket
1 hard drive cage 2 hard drive
3 hard drive bracket
1 hard drive 2 hard drive bracket
3 hard drive cage