Dell PRECISION 530 - Manual (Page 91)

Removing and Installing Parts 91
8 If the replacement drive does not have bracket rails attached, remove
the rails from the old drive by removing the four screws that secure the
rails to the drive. Then attach the bracket rails to the replacement
drive (see the following figure).
NOTE: If you are not replacing an existing drive and the new drive does
not have bracket rails attached, install the extra rail set that is located
inside your computer in an empty drive bay.
A t t a c h i n g B r a c k e t Ra i l s f o r a n E x t e r n a l l y A c c e s s i b l e D r i v e
9 Slide the drive/bracket assembly into the drive bay until both drive
bracket tabs snap securely into place (see the following figure).
bracket rails (2)
screws (4)
drive