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Old 04-16-2012, 08:02 PM   #1
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Registered: Sep 2011
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Can't mount device: mount you must specify the filesystem type

I had a raid 1 working with two devices sdc1 and sdd1, 2TB each. I needed some space, so I decided to undo the raid. I must say I'm too new with raids, and I successfully removed sdc1 with "fail" and "remove" mdadm commands, but not with sdd1, so I left the raid working and mounted the filesystem as follows:

/dev/sdc1 -> /data
/dev/md0 -> /data2

But a few days ago this "workaround" end up with a very bad and serious message forcing the server a reboot and rescue mode working.

I successfully removed the raid and mounted /dev/sdc1 into /data, but when I try to mount sdd1 into /data2 I get:

mount: you must specify the filesystem type
So, I exec:
mount -t ext4 /dev/sdd1 /data2
And I get the same error message. I tried with ext2 and ext3, but had the same result.

I also get this on dmesg:

VFS: Can't find ext3 filesystem on dev sdd1.

When I execute "fsck /dev/sdd1" I get the following:

fsck 1.39 (29-May-2006)
e2fsck 1.39 (29-May-2006)
Couldn't find ext2 superblock, trying backup blocks...
fsck.ext3: Bad magic number in super-block while trying to open /dev/sdd1

The superblock could not be read or does not describe a correct ext2
filesystem. *If the device is valid and it really contains an ext2
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
* * e2fsck -b 8193 <device>
"fdisk -l /dev/sdd" reveals the following:

WARNING: GPT (GUID Partition Table) detected on '/dev/sdd'! The util fdisk doesn't support GPT. Use GNU Parted.

Disco /dev/sdd: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Unidades = cilindros de 16065 * 512 = 8225280 bytes

Device                 Begin      End      Blocks  Id  System
/dev/sdd1               1      243201  1953512032   83  Linux

I successfully executed "mdadm --zero-superblock /dev/sdd1", but I got "mdadm: Unrecognised md component device - /dev/sdd1"

I tried everything my expertise could, but with no positive results.

Please, note that sdc1 and sdd1 have now different data, so I can't create a new raid 1 and put these disks into this raid.
Old 04-17-2012, 05:52 AM   #2
Registered: Mar 2007
Location: Spain
Distribution: Debian
Posts: 201

Rep: Reputation: 36
Try using testdisk to see if you can recover.


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