Yamaha CRW8424SX Series Owner's Manual page 26

2 Connect the other end of the SCSI cable to the rear of your CRW8424SX
drive. Either SCSI connector (marked "SCSI-1" and "SCSI-2") may be used.
3 Connect the D-shaped end of the included power cable to the power
connector at the rear of your CRW8424SX drive. Connect the other end of
the cable to an electrical outlet.
Electrical plugs/sockets vary according to country/region.