Dell Precision 370 - Manual (Page 144)

3 screws (4)
4. Gently slide the drive into place until the tabs securely click into position.
NOTE: If you are installing a hard drive in the lower bay, the drive should be placed in the bay so that the power
connector is on the left-hand side (opposite of the top hard drive).
Serial ATA Drive
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.
Serial ATA Drive