Re: Extracting directories from an ISO image, command line tool?

[Richard Owlett <rowlett@cloud85.net>]

Thomas Schmitt wrote:
> Hi,
>
> Richard Owlett wrote:
> > richard@jessie:~$  ls -l /media/richard/Lexar/dvd8_2.iso
> > -rw-r--r-- 1 richard richard 3976200192 Sep  9 07:36 /media/richard/Lexar/dvd8_2.iso
> >
> > richard@jessie:~$  /sbin/isosize /media/richard/Lexar/dvd8_2.iso
> > 4677738496
>
> You will need to get a new dvd8_2.iso of at least 4677738496
> bytes size.
>
>
> > I've got some links "somewhere" for copying DVDs to files such that
> > checksums can be verified. Suspect that info may useful.
>
> Depending on the DVD medium type you have to expect trailing
> garbage after the end of the ISO. This has to be taken into
> respect when copying, diffing, or md5summing.
>
> I would use for copying from DVD to disk:
>
>    blocks=$(expr $(/sbin/isosize /dev/sr0) / 2048)
>    echo "Byte count: $(expr $blocks '*' 2048)"
>
>    dd if=/dev/sr0 bs=2048 count=$blocks of=dvd8_2.iso
>
> (It would be nice if Debian's MD5SUMS would not only tell
>   MD5 and image name but also the image size, or if there
>   was a SIZES file.)
>
> Error messages from dd or dvd8_2.iso turning out smaller than
> the announced byte count indicate failure of copying.

It appears that all of my dvd8_*.iso (except possibly dvd8_1.iso) 
were defective.
Using instructions above to create dvd8_2.iso apparently works.
Don't know what I did wrong last time around.

Thank you.