linux-ext4 - Issue with bad file system

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Date:	Sun, 18 Nov 2012 23:46:14 -0500
From:	Drew Reusser <dreusser@...il.com>
To:	linux-ext4@...r.kernel.org
Subject: Issue with bad file system

Hello all,

I am having an issue with a ext4 file system which I cannot get to
come back up.  There were no changes that I know of, but I rebooted,
and when the system came back up it was not able to read from the hard
drives.  I have it setup in a raid 10 configuration, and can mount the
raid array with no issues.  However when I mount the file system, I
get the following error "EXT4-fs (md0): VFS: Can't find ext4
filesystem" from the log files.

Is there anyone that can help as I have to get this data back and I
prefer not to have to go to a professional to get it back and spend
the money.

-Drew

Basic Info:  4x1TB disks, raid 10 equaling 2TB total.  All four disks
are just one giant partition starting at the 2MB mark so I could boot
and put mdadm in the boot sector and get into linux.

Some basic commands below:

mint mnt # mount -t ext4 /dev/md0 /mnt/raid
mount: wrong fs type, bad option, bad superblock on /dev/md0,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

C is the pen-drive I am booting from currently and F is the 2TB disk I
was using to backup to.

mint dev # cat /proc/partitions
major minor  #blocks  name

   7        0     939820 loop0
   8        0  976762584 sda
   8        1  976760832 sda1
   8       16  976762584 sdb
   8       17  976237568 sdb1
   8       32    1985024 sdc
   8       33    1984960 sdc1
   8       48  976762584 sdd
   8       49  976760832 sdd1
   8       64  976762584 sde
   8       65  976237568 sde1
  11        0    1048575 sr0
   8       80 1953514584 sdf
   8       81 1953512448 sdf1
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