Bug#688229: Burning data DVD looks successful but mounting fails with ISOFS: Unable to identify CD-ROM format.

Paul Menzel pm.debian at googlemail.com
Sun Sep 23 10:10:15 UTC 2012


Dear Thomas,


thank you again for your fast reply. Could you please CC me, since I am
not subscribed and need to import your message from the BTS every time.


Am Samstag, den 22.09.2012, 12:04 +0200 schrieb Thomas Schmitt:

> Paul Menzel wrote:
> > $ dd if=/dev/sr1 bs=2048 skip=16 count=1 | od -c
> > ...
> > 0000000   >  \0   0 034 001  \0  \0 001 034   0   F 034   +  \0  \0   +
> > 0000020 034   F   p  \t 023 022   1   !  \0  \0  \0  \0 001  \0  \0 001
> > 0000040 034  \0   I  \0   M  \0   G  \0   _  \0   2  \0   4  \0   2  \0
> > 0000060   8  \0   .  \0   J  \0   P  \0   G  \0   ;  \0   1  \0   >  \0
> > 0000100 224   ! 001  \0  \0 001   ! 224   @ 276   +  \0  \0   + 276   @
> > 0000120   p  \t 023 022   1   !  \0  \0  \0  \0 001  \0  \0 001 034  \0
> > 0000140   I  \0   M  \0   G  \0   _  \0   2  \0   4  \0   2  \0   9  \0
> > 0000160   .  \0   J  \0   P  \0   G  \0   ;  \0   1  \0   >  \0  \f   '
> 
> This does not look like an ISO 9660 Primary Volume Descriptor but
> rather like a snippet from a Joliet directory tree. Read as 16 bit
> characters one can recognize "IMG_2428.JPG" and "IMG_2429.JPG".
> They are announced to start at blocks 72752 (decimal) and 74132
> (decimal). Sizes are 2825286 and 2866752 bytes.
> ... if i decoded these little endian 32-bit numbers correctly:
>    0 034 001  \0   IMG_2428.JPG, Location of Extent
>    F 034   +  \0   IMG_2428.JPG, Data Length
>  224   ! 001  \0   IMG_2429.JPG, Location of Extent
>    @ 276   +  \0   IMG_2429.JPG, Data Length
> (The layout of directory records is documented in ECMA-119, 9.1.
>  Joliet deviates from this layout mainly by using 16-bit characters
>  for File Identifier.)

Nice find!

> I really wonder how this could get to block 16 of the medium.
> Brasero did order libisofs to produce a Joliet tree. But it should
> be stored several blocks after block 16. Before Joliet there
> should be volume descriptors and the ISO 9660 + Rock Ridge tree.
> 
> It is clear that no reader software wants to accept this as ISO 9660
> filesystem.
> 
> Guessing from this single block content, i would expect that a
> few hundred kilobytes of the image start have not been written
> onto the medium. Most simple explanation for this would be that they
> were not transmitted from libisofs to libburn. But i riddle how
> this could be possible.

Is there some way to simulate a burner to find out what happened?

[…]

> > $ dvd+rw-mediainfo /dev/sr1
> 
> The output looks totally normal. Medium is ok.
> 
> 
> > I think I forgot to add that the burner and the same DVD medium were
> > used successfully with for example K3b and I also think xorriso.
> 
> We have no special indication of any malfunction of burner or medium.
> There are just not the right bytes stored at the right block addresses.
> 
> A further test with xorriso would be welcome. Just to be sure.

Everything worked fine with `xorriso`.

        $ xorriso -md5 on -outdev /dev/sr1 -map ~/test /
        xorriso 1.2.2 : RockRidge filesystem manipulator, libburnia project.
        
        Drive current: -outdev '/dev/sr1'
        Media current: DVD-R sequential recording
        Media status : is blank
        Media summary: 0 sessions, 0 data blocks, 0 data, 4489m free
        xorriso : UPDATE : 123 files added in 1 seconds
        Added to ISO image: directory '/'='/home/joe/test'
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        xorriso : UPDATE : Writing:     917360s   86.6%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:     922784s   87.1%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:     928208s   87.6%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:     933632s   88.1%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:     939056s   88.6%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:     944480s   89.1%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:     949904s   89.6%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:     955328s   90.2%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:     960752s   90.7%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:     966176s   91.2%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:     971600s   91.7%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:     977024s   92.2%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:     982448s   92.7%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:     987872s   93.2%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:     993280s   93.7%   fifo 100%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:     998720s   94.2%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:    1004144s   94.8%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:    1009568s   95.3%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:    1014992s   95.8%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:    1020416s   96.3%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:    1025840s   96.8%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:    1031264s   97.3%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:    1036688s   97.8%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:    1042112s   98.3%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:    1047536s   98.9%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:    1052960s   99.4%   fifo  99%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:    1058384s   99.9%   fifo  56%  buf 100%    8.0xD 
        xorriso : UPDATE : Writing:    1059698s  100.0%   fifo   0%  buf 100%    1.9xD 
        xorriso : UPDATE : Writing:    1059698s  100.0%   fifo   0%  buf 100%    0.0xD 
        xorriso : UPDATE : Writing:    1059698s  100.0%   fifo   0%  buf 100%    0.0xD 
        xorriso : UPDATE : Closing track/session. Working since 226 seconds
        xorriso : UPDATE : Closing track/session. Working since 227 seconds
        xorriso : UPDATE : Closing track/session. Working since 228 seconds
        xorriso : UPDATE : Closing track/session. Working since 229 seconds
        xorriso : UPDATE : Closing track/session. Working since 230 seconds
        xorriso : UPDATE : Closing track/session. Working since 230 seconds
        xorriso : UPDATE : Closing track/session. Working since 231 seconds
        xorriso : UPDATE : Closing track/session. Working since 232 seconds
        xorriso : UPDATE : Closing track/session. Working since 233 seconds
        xorriso : UPDATE : Closing track/session. Working since 234 seconds
        xorriso : UPDATE : Closing track/session. Working since 235 seconds
        xorriso : UPDATE : Closing track/session. Working since 236 seconds
        xorriso : UPDATE : Closing track/session. Working since 237 seconds
        xorriso : UPDATE : Closing track/session. Working since 238 seconds
        xorriso : UPDATE : Closing track/session. Working since 239 seconds
        xorriso : UPDATE : Closing track/session. Working since 240 seconds
        xorriso : UPDATE : Closing track/session. Working since 241 seconds
        xorriso : UPDATE : Closing track/session. Working since 242 seconds
        xorriso : UPDATE : Closing track/session. Working since 243 seconds
        xorriso : UPDATE : Closing track/session. Working since 244 seconds
        xorriso : UPDATE : Closing track/session. Working since 245 seconds
        xorriso : UPDATE : Closing track/session. Working since 246 seconds
        xorriso : UPDATE : Closing track/session. Working since 247 seconds
        xorriso : UPDATE : Closing track/session. Working since 248 seconds
        xorriso : UPDATE : Closing track/session. Working since 249 seconds
        xorriso : UPDATE : Closing track/session. Working since 250 seconds
        xorriso : UPDATE : Closing track/session. Working since 251 seconds
        xorriso : UPDATE : Closing track/session. Working since 252 seconds
        xorriso : UPDATE : Closing track/session. Working since 253 seconds
        xorriso : UPDATE : Closing track/session. Working since 254 seconds
        xorriso : UPDATE : Closing track/session. Working since 255 seconds
        ISO image produced: 1059548 sectors
        Written to medium : 1059712 sectors at LBA 0
        Writing to '/dev/sr1' completed successfully.

The only thing I noticed, that another DVD drive, the Toshiba DVD-ROM
SD-M1712, needed more than 25 seconds to recognize the disc. But after
that it could be mounted without a problem.


Thanks,

Paul
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