> > style (sectors directly addressable both on reads and writes).
> >
> > i've heard that DVD-RW doesn't (but it allows recording DVD's readable in
> > DVD players), DVD+RW does but with tool to format it (exist in pkgsrc),
> > DVD-RAM - yes
> >
> > 2) is 1) supported in NetBSD?
>
> Growisofs (from dvd+rw-tools) will format (if needed) and write
> arbitrary blocks to dvd+r and dvd+rw.  Normally it is used with
> mkisofs to make a CD-compatible file system, but if you really wanted
> you could put a raw tar file on the DVD (or in theory even a unix fs
> if the unix fs could deal with the dvd's 32k block size.)

so no easy way to just have /dev/cd.. writable.

without it - i will buy DVD-RW as it has cheapest media and best read
support. and use cdbackup/cdrestore tools as i need backup device other
than tape