external usb dvdrw

[Warner Losh]

> i have a LG dvdrw and a vipower external enclosure,
> and a toshiba notebook that can burn dvd's and cd's
> using it.
> 
> every command that is not reading a cd/dvd gets me an
> error. when i run dvd+rw-mediainfo /dev/cd0 it
> produces an 0x46 error in dmesg.

I've managed to get this working on current by minor tweaks to the
umass driver to not ignore certain commands, but to pass them through.
This was also independently done by phk, but there's some issues with
the simple hack that might destabilize the thumb drives.  This
ordinarily wouldn't bother me, but the goofy things are fragile enough
as it is, and any extra protection there is likely a good thing...

You may have a different problem, however.  I used cdrecord with the
dvd+rw extensions (growisofs) and found that I got many warnings in
the log, I was able to burn a dvd in all but one of the cases I tried.
That one case I think was a problem with the production of data using
dump was so slow that I couldn't stream the data to the dvd.  Some
blanks tolerated this well, while others didn't (or I got lucky on
some, unlucky on others).  Without seeing the messages from the
applications that you are using, and a complete dmesg, it is hard to
say for sure.

Warner