Linux knl 2.6.26-2-amd64 #1 SMP Thu Nov 5 02:23:12 UTC 2009 x86_64 GNU/Linux
Debian GNU/Linux 5.0


CD-RW disc burnt using wodim can not be mounted. It doesn't depend of the
media type - this same behavior I got using CD-R, CD-RW and DVD discs. Error
message is:

      mount: I could not determine the filesystem type, and none was specified

or
      mount -t iso9660 /dev/sr0 ./tmp/
       mount: wrong fs type, bad option, bad superblock on /dev/sr0,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so
dmesg|tail
[ 3801.136760] ISOFS: Unable to identify CD-ROM format.

After some tests I found that some first bytes of an  image burnt onto a disc
are different comparing them with the original iso9660 image file used.

Full description of tests that I made and files used or generated during them
are contained in attached tar file.

Marek Szymczyk