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I'm trying to mount harddrive from HP ProBook 4525s to another computer for data backup from damaged laptop. There are two ext4 and one swap partition on hdd. I'm using SATA-USB adapter, but after I connect the hdd and I try to mount it

sudo mount -t ext4 /dev/sdc6 /media/backup

I'm getting these error:

mount: wrong fs type, bad option, bad superblock on /dev/sdc6,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail  or so

dmesg|tail returns:

[ 3776.183964] sd 10:0:0:0: [sdc] CDB: Read(10): 28 00 05 d2 28 50 00 00 08 00
[ 3776.183982] end_request: critical target error, dev sdc, sector 97658960
[ 3776.184002] EXT4-fs (sdc6): can't read group descriptor 9
[ 3986.395636] sd 10:0:0:0: [sdc] Unhandled sense code
[ 3986.395642] sd 10:0:0:0: [sdc]  Result: hostbyte=invalid driverbyte=DRIVER_SENSE
[ 3986.395649] sd 10:0:0:0: [sdc]  Sense Key : Medium Error [current] 
[ 3986.395657] sd 10:0:0:0: [sdc]  Add. Sense: Unrecovered read error
[ 3986.395665] sd 10:0:0:0: [sdc] CDB: Read(10): 28 00 05 d2 28 48 00 00 08 00
[ 3986.395683] end_request: critical target error, dev sdc, sector 97658952
[ 3986.395699] EXT4-fs (sdc6): can't read group descriptor 8

I'm using Ubuntu 12.04.

share|improve this question
You did try to make in image via ddrescue? – Bobby Jun 14 '12 at 9:25
I am trying right now, i run dd_rescue /dev/sdc1 /home/user/bckp.img but it just unconnect hard-drive from sdc to and connect as sdb, the process keep running but still getting "bad block reading" error – user140075 Jun 14 '12 at 9:39
Though more frequently with Dell laptops, I've had one or two HP hard drives that were not readable as soon as they were plugged into different hardware. I'm not saying this is the problem, but it's a consideration. Alternatively, the drive may just be dead. – user3463 Jun 14 '12 at 9:46
How about booting to a Knoppix Live CD with the drive plugged in and see if Knoppix picks up the drive? – jmreicha Jun 14 '12 at 15:00

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