Toshiba SD-M1401 Hardware Instruction Manual page 11

Terminator ON/OFF Jumper
This jumper turns termination power ON or OFF. The default setting
is termination disabled (no jumper). If you are connecting more than
one SCSI device to your system, and the SD-M1401 DVD-ROM is not
at the end of the chain, then terminator jumper is not required.
512/2K (Block Size Selectability)
This jumper is used to select default block size. When the jumper is
present, the default block size equals 512Bytes, when the jumper is not
present, the default block size is 2048Bytes. This is effective for CD
media only, not DVD media.
Test (Audio Playback Jumper)
This setting selects the drive operation between normal CD-ROM and
CD-Audio player mode. When jumper is set to ON position (jumper
present), commands from the host computer are ignored (note: SCSI-
ID must be set to 0). This jumper is for test purposes only and should
be set to OFF (no jumper present) for proper CD-ROM function.
Power Supply (Termination Power Jumper)
Toshiba SCSI DVD-ROM drives can supply power to other equip-
ment on the SCSI BUS. When the jumper is ON, the drive will supply
termination power. At least one device on the SCSI BUS must supply
the termination power. If you're not sure if any other device supplies
termination power, it is fine to leave the jumper ON.
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TOSHIBA SD-M1401 DVD-ROM Drive