Dell OptiPlex 390 (Mid 2011) - Manual (Page 22)

6. Repeat the above steps for the second hard drive, if available.
Installing The Hard Drive
1. Flex the hard drive bracket and then insert the hard drive into the bracket.
2. Press both blue securing-bracket tabs inward and slide the hard drive
bracket into the bay in the chassis.
3. Connect the data cable and power cable to the back of the hard drive.
4. Install the
cover .
5. Follow the procedures in After Working Inside Your Computer .
22