Sony SDX-400C User Manual page 6

Notice of SCSI Termination
The SDX-400C conforms to the Microsoft PC97 standard which requires
the internal (naked) drive to be terminated with an external terminator.
Microsoft PC97 SCSI requirements
SCSI peripherals must not terminate the bus. Both internal and external
cable ends are instead terminated by plug-in connectors.
Host Computer Wide SCSI
6
68p cable
Example of SCSI set-up
Terminator
This drive