[mdlug] Mystery file system

[Aaron Kulkis]

R KANNAN wrote:
> I got  data CD from someone and I am unable to mount the file system
> on Linux but I can read it fine on Windows XP. The file system on
> Windows says UDF and had about 700MB of data on it. While mounting on
> Linux it just says
> 

$ su
password:
# od -c /dev/dvdrecorder | less


You should see the filesystem type spelled out in the first few characters.

For example, here are the first few bytes of an XFS filesystem:
root at kulkilap:/home/akulkis>  od -c /dev/sda6 | less
0000000   X   F   S   B  \0  \0 020  \0  \0  \0  \0  \0 001   O   7  \0
0000020  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0



> mount: wrong fs type, bad option, bad superblock on /dev/dvdrecorder,
>        missing codepage or other error
>        In some cases useful info is found in syslog - try
>        dmesg | tail  or so
> 
> dmesg|tail shows
> UDF-fs: No partition found (1)
> Unable to identify CD-ROM format.
> end_request: I/O error, dev sr0, sector 336000
> Buffer I/O error on device sr0, logical block 42000
> end_request: I/O error, dev sr0, sector 336000
> Buffer I/O error on device sr0, logical block 42000
> end_request: I/O error, dev sr0, sector 336000
> Buffer I/O error on device sr0, logical block 42000
> end_request: I/O error, dev sr0, sector 336000
> Buffer I/O error on device sr0, logical block 42000
> end_request: I/O error, dev sr0, sector 336000
> Buffer I/O error on device sr0, logical block 42000
> end_request: I/O error, dev sr0, sector 336000
> Buffer I/O error on device sr0, logical block 42000
> end_request: I/O error, dev sr0, sector 335944
> Buffer I/O error on device sr0, logical block 41993
> end_request: I/O error, dev sr0, sector 335944
> Buffer I/O error on device sr0, logical block 41993
> UDF-fs: No partition found (1)
> 
> Any ideas?
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