> I used growisofs one month ago and now have problems reading my dvd+rw
> (while I had checked they were okay the day I burned them)

I have no comment on this. Except that it's most likely question to your
media manufacturer.

> "growisofs -Z /dev/cdrom -R -J /my/file"
> "Executing 'mkisofs -R -J /my/file | builtin_dd of=/dev/cdrom obs=32k
> seek=0'
> :-( unable to unmount /dev/cdrom: No such file or directory"

There was a bug introduced in 5.4 and corrected in 5.5, which manifests
in this exact manner. Upgrade or invoke growisofs by absolute path, e.g.
/usr/local/bin/growisofs -Z /dev/cdrom ...'

> When I try "dd if=/my/file.iso of=/dev/cdrom obs=32k" I get
> ... the fs is read-only.

To get dd working you have to patch the kernel. But please note that it
makes no sense to patch the kernel solely for dd's sake, as growisofs
fills in for it perfectly. In other words, if volumes generated by
mkisofs is your sole goal, stick to user-land and abstain from patching
kernel. A.


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