Sony SMO-F551 Technical Manual page 19

Disable SCSI Parity
Disable Write Cache
Disable Auto Spin-up
Force Verify for Write
command
Disable Manual Eject
When the pair of pins A4/B4 is open, the drive performs SCSI
parity checking (factory default). Shorting pins A4/B4 with a
jumper socket forces the drive NOT to perform the SCSI parity
checking.
When the pair of pins A5/B5 is open, the drive performs write
back caching (factory default).
jumper socket forces the drive NOT to perform the write back
caching.
WARNING: Write cache is enabled as default setting. The
integrity of the buffer memory content is not guaranteed
through power cycling.
Caution: "Disable Write Cache" setting works as an "OR"
function with the optional dip switch setting.
This function switch (A6/B6) controls drive's automatic spin-up
mode. When the pair of pins A6/B6 is open, the drive
automatically spins up the media upon loading (factory default).
Shorting this pair of pins with a jumper pin disables the
automatic spin up.
Caution: "Disable Auto Spin-up" setting works as an "OR"
function with the optional dip switch setting.
Shorting the pair of pins (A7/B7) forces the drive to performs
Write and Verify operation whenever the drive executes WRITE
command.
Shorting the pair of pins A8/B8, disables the eject button
operation. (i.e. the medium cannot be manually unloaded.)
Shorting pins A5/B5 with a
SMO-F551 Technical Guide and Specifications
Sony Corporation 1998
19