Seagate BARRACUDA 4LP ST34571N/W/WC/WD/DC - Manual (Page 47)

Barracuda 4LP Installation Guide, Rev. B 45
WC/DC drives
WC/DC drives section Setting the SCSI ID jumpers
The SCSI ID for “WC” and “DC” model drives is normally set
over the SCSI bus by the host system using connector contacts
39 (ID0), 40 (ID2), 79 (ID1), and 80 (ID3). Users need not install
jumpers to select SCSI ID.
Terminating the drive
“WC” and “DC” model drives do not have internal terminators or
any other way of adding internal termination to the drive. Exter-
nal termination for these drives is normally supplied by the host
equipment when termination is required.