Dell PRECISION 530 - Manual (Page 69)

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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.
NOTE: You must use the shoulder screws shipped with the spare drive
rails.
A t t a c h i n g B r a c k e t Ra i l s f o r a H a r d D r i v e
7 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)
shoulder screws (4)
drive