Dell Precision 330 - Manual (Page 28)

Installing the Hard-Drive Bracket (Mini Tower Chassis)
4. Connect the interface cable for the drive. See " Attaching Hard-Drive Cables (Mini Tower Chassis) ."
a. If you are installing an EIDE device, ensure that the IDE interface cable is properly connected to the EIDE connector on the system board.
b. If you are installing a SCSI device, ensure that the SCSI interface cable is properly connected to the interface connector on the SCSI controller board.
5. Connect a DC power cable to the power input connector on the back of the drive (see the following figure).
Attaching Hard-Drive Cables (Mini Tower Chassis)
NOTE: When you rotate the drive door back into place, ensure that the tabs on the drive door are inserted between the drive bracket and the drive cage.
NOTE: Be sure to fold down the drive door handle so that the front panel can be replaced on the chassis.
NOTICE: To avoid possible damage, you must match the colored strip on the interface cable with pin 1 on both the drive and system board connectors.