Re: DVD-R as backup medium: growisofs + udftools

["Thomas Schmitt" <scdbackup@gmx.net>]

Hi,

Giuseppe "Cowo" Corbelli: 
> But I need to store intermediate archives on some filesystem, which I
> was trying to avoid.

If you can talk your backup system into starting
a pipe of  afio | cdrskin -multi  then this should be
achievable.

cdrskin is my offer of a burn backend. You need
at least version 0.3.6 for writing DVD-R.
Source tarball and x86 binaries of 0.4.0 are available
at:
  http://scdbackup.sourceforge.net/cdrskin_eng.html

I did not succeed in talking growisofs to burn
multi-session with non-ISO formats. Maybe if
one studies the argument interpreter of growisofs.c
then one could find a way to do so.
Hehe, there must be some sport where cdrskin is more
easy than growisofs, after all. :))


me:
> > I prefer to format them to overwriteable state:
> >   dvd+rw-format -force /dev/sr0
> > This avoids the need for lengthy full blanking before
> > re-use.
Giuseppe "Cowo" Corbelli: 
> Good to know!

I have to point out that formatted DVD-RW are not
capable of multi-session.

If the image format is always ISO-9660 then one
can emulate multi-session because the image size
is stored at a well defined position.
But with afio or star archives it is not easily
possible to determine the size of the valid payload.
(It is not impossible if one is willing to read the
whole payload plus some trailing garbage.)

So DVD-RAM, DVD+RW and formatted DVD-RW are not
suitable for my proposal in the previous mail.


Have a nice day :)

Thomas