From: "Justin T. Gibbs" <gibbs@freefall.freebsd.org>

> >I have a Syquest EZ-135 drive, which once in a great while appears to
> >return UNIT ATTENTION for no obvious reason.
> >
> >messages.5:Sep 18 15:40:01 jfwhome /netbsd: sd4(aha0:4:0): unit attention, dat
> >a = 00 00 00 00 00 00 00 00 00 00 00 00 00 00

> Can you find out what the ASC and ASQ are for that sense operation?

Assuming the driver printed the correct data there, ASC and ASQ were 00h 00h,
"no additional sense information".

I have enabled the debug print statement at the top of the routine that
interprets scsi errors, so I'll get more detailed information next time.