Dell Precision 650 - Manual (Page 51)

4. Gently slide the drive into place until the tabs securely click into position.
5. If you are installing a drive that has its own controller card, install the controller card in an expansion slot.
See the documentation that accompanied the drive and controller card to verify that the configuration is correct for your computer.
6. Connect the power and hard-drive cables to the drive.
1 drive
2 bracket rails (2)
3 screws (4)
NOTICE: Match the colored strip on the cable with pin 1 on the drive (pin 1 is marked as "1").