[H] Recover my SDCARD without losing data topic

There is an issue with my SDcard, I don't know how it happened, I did nothing special on it.

It appears as unformatted BUT, I know that the data is still there because the CWM manages to browse files if I get into the menu "install zip from /sdcard1", but it can't see anything if I try a "restore from sdcard1"...

Weird huh ?

So I have an ubuntu build and I'd like to try to repair the "masterboot" with your help :)

I never did this before so I don't really know what I need, SDCard is 32 GB class 10.

When I plug my phone from CWM and enable the mount the SDcard on usb I got this error message :
Error mounting: mount: /dev/sdb1: can't read superblock

Here is the result of the "fdisk -l" command :

Code:

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Disk /dev/sdb: 32.0 GB, 32018268160 bytes
32 heads, 63 sectors/track, 31019 cylinders, total 62535680 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x4d544f4f

  Device Boot      Start        End      Blocks  Id  System
/dev/sdb1            2048    62535679    31266816    b  W95 FAT32

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Which actually looks weird, I thought that my sdcard were ext4 formated, well but I am not 100% sure about that...

Here the result of the command "fsck -y /dev/sdb1"

Code:

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fsck from util-linux 2.20.1
dosfsck 3.0.12, 29 Oct 2011, FAT32, LFN
/
  Contains a free cluster (2). Assuming EOF.
FAT32 root dir starts with a bad cluster!

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What else can I do ? :eek: