Dell Precision 330 - Manual (Page 25)

2. Slide the new drive/bracket assembly into the drive bay until both drive bracket tabs snap securely into place (see the following figure).
Installing the Drive Bracket (Mini Tower Chassis)
3. Connect the interface cable for the drive. See " Attaching Drive Cables (Mini Tower Chassis) ."
a. If you are installing an EIDE device, ensure that the 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.
4. Connect a DC power cable to the power input connector on the back of the drive (see the following figure).
Attaching Drive Cables (Mini Tower 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.