Seagate BARRACUDA 4LP ST32171N/W/WC/WD/DC Installation Manual page 22

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For information about how to terminate your drive, refer to the
appropriate drive-specific section.
Internal SCSI cable
Internal
SCSI device
Figure 2. SCSI bus termination
Terminator power
You usually will not need to change this option and can normally
leave the drive configured as it was shipped from the factory. For
information about how to change the terminator power option on
your drive, refer to the appropriate drive-specific section.
I/O circuits and data path widths
• "WD" and "DC" models use differential I/O circuits. You cannot
mix these models with single-ended models ("N," "W," "WC")
on the same SCSI bus. The circuits are incompatible with
each other.
• "W," "WD," and "WC" models have a "wide" (16-bit) SCSI data
bus rather than the standard (non-wide) 8-bit SCSI data bus;
however, you can use these wide drives on a standard (non-
wide) 8-bit data bus.
Barracuda 4LP Installation Guide, Rev. B
Internal SCSI cable
Internal
SCSI device SCSI device
Terminate
Internal
Controller
SCSI device
Internal
Controller
External
SCSI
cable
Terminate
External External
SCSI device SCSI device