I have a second HD partitioned and formated to EXT4, the whole capacity. It was mounted to a directory in my home folder
I'm getting an error that it cannot be mounted.

Running "dmesg | tail" i get this: (rigt now the HD is connected to the computer using a USB adaptor)

Code:
laptop:~> dmesg | tail
[  375.821495] sd 9:0:0:0: [sdb] Write Protect is off
[  375.821505] sd 9:0:0:0: [sdb] Mode Sense: 00 38 00 00
[  375.821512] sd 9:0:0:0: [sdb] Assuming drive cache: write through
[  375.823508] sd 9:0:0:0: [sdb] Assuming drive cache: write through
[  375.823519] sdb: detected capacity change from 0 to 320072933376
[  375.832768]  sdb: sdb1
[  375.834621] sd 9:0:0:0: [sdb] Assuming drive cache: write through
[  375.834632] sd 9:0:0:0: [sdb] Attached SCSI disk
[  376.360004] EXT4-fs (sdb1): ext4_check_descriptors: Block bitmap for group 1 not in group (block 1026)!
[  376.360480] EXT4-fs (sdb1): group descriptors corrupted!

What can i do to save the data ?