Re: [Dvdrtools-users] Backup of a partition with compression

[Volker Kuhlmann]

> Now I'm at a loss. I tried using the streaming mode of growisofs/mkisofs; 
> that works insofar as I don't get error messages, but the file on the DVD 
> cannot be read later (as it is > 2 GB, I assume).

What actually happens? What commands did you use? Are you compressing
the whole partition, or a tar file of the files of the partition?

The following should work:

gzip </dev/... | growisofs -Z /dev/dvdrecorder=/dev/stdin
tar -czf- /...| growisofs -Z /dev/dvdrecorder=/dev/stdin

Neither of those commands call mkisofs for you.

You may run into issues with the piping having a too small buffer, but
there's a way round that with a nifty piece of buffering software.

The problem with the above method is that you don't know when to stop
reading, so you should log the output of growisofs which gives you the
number of blocks written. Use dd to read the disk, piping it into tar or
gzip.

Volker

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