Re: [Libcdio-devel] Re: Retrieving DATA session from multisession audio disc

[Eric Shattow \"Eprecocious\"]

Backing the topic up a bit, how about doing the extracting using
libcdio?  extricate.c makes use of linux/cdrom.h which is not
portable. A libcdio-based tool would be preferable.

On Thu, Apr 15, 2010 at 12:12 PM, Thomas Schmitt <address@hidden> wrote:
> Hi,
>
>> Using isoinfo (NOT iso-info) it seems stuff is in place:
>> [morituri-uninstalled] address@hidden trunk]$ isoinfo -N 207106 -i
>> Ladyhawke\ -\ Ladyhawke/data.iso  -l
>
> So the offset 207106 seems to be the right one.
> (I found this helptext of isoinfo:
>  http://www.herongyang.com/CD-DVD/Data-CD-ISO-9660-isoinfo.html
>  "-N sector   Sector number where ISO image should start on CD"
> )
>
>
>> a) can I write this (wrong) iso as is to a mixed mode cd to make a
>> perfect copy of my cd ?
>
> You will have to put it exactly to offset 207106
> so that it works unaltered.
> Possibly one can do that with cdrecord -sao or
> some -raw* option if one has suitable input files
> for the tracks which come before the ISO track.
>
> But that's outside of my own experience.
>
>
>> I couldn't get this to mount either:
>> address@hidden thomas]# mount -t iso9660 -o loop,sbsector=207106 dummy.iso 
>> /mnt/iso/
>
> Did you append the image to the end of a file of
> exactly the right size ?
> In this case:
>
>   dd if=/dev/zero \
>   bs=2K count=1 seek=207105 \
>   of=cd_dummy.iso
>
> Note that you have to seek to (207106 - 1)
> and then write 1 block, to get 207106 blocks.
>
> Does this cd_dummy.iso show with ls -l a size of
> 424153088 bytes ? (Before you append data.iso)
>
>
> I just tried this with a multi-session CD on
> Debian 5.04. Track start block is 109287,
> track size is 3497:
>
>  $ dd if=/dev/hda bs=2048 skip=109287 count=3497 of=track1.iso
>  $ dd if=/dev/zero bs=2K count=1 seek=109286 of=cd_dummy.iso
>  $ cat track1.iso >> cd_dummy.iso
>  $ su
>  # mount -t iso9660 -o loop,sbsector=109287 cd_dummy.iso /mnt
>  # ls /mnt
>
> shows lots of files.
>
>
> ------------------------------------------------
>
>> > Adventurous testers could try losetup option -o
>> > with a negative value or mount option "offset".
>> What value would this be there ? I tried in a loop with lots of values,
>> none worked.
>
> I would have thought that this might work
>
>  # losetup -f
>  /dev/loop0
>  # losetup -o -207106 /dev/loop0 data.iso
>  # mount -t iso9660 -o sbsector=207106 /dev/loop0 /mnt
>
> but on Debian 5.04 (with 109287) it doesn't.
>
>
>
>
>
>