input/output error bad blocks how to fix?

BW-userx · 10-08-2016, 01:32 PM

WIndows with chkdsk says it is raw data .. it is a msdos format WD passport 1tb usb
gparted doesn't know that it is, just gives me input/output error

Code:

[  805.226933] blk_update_request: critical medium error, dev sdc, sector 2048
[  805.503998] sd 6:0:0:0: [sdc] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x08
[  805.504004] sd 6:0:0:0: [sdc] tag#0 Sense Key : 0x3 [current] 
[  805.504007] sd 6:0:0:0: [sdc] tag#0 ASC=0x11 ASCQ=0x0 
[  805.504011] sd 6:0:0:0: [sdc] tag#0 CDB: opcode=0x28 28 00 00 00 08 00 00 00 08 00
[  805.504014] blk_update_request: critical medium error, dev sdc, sector 2048
[  805.504018] Buffer I/O error on dev sdc, logical block 256, async page read

that is the dmsg pertaining to this usb hard drive. sector 2048 what is that, can this be fixed or rescued to get the data off it?

I've tried mounting it ntfs-3g

Code:

[userx@Voided ~]$ sudo mount /dev/sdc1 /mnt
mount: wrong fs type, bad option, bad superblock on /dev/sdc1,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.

Code:

[userx@Voided ~]$ sudo mount -t ntfs-3g /dev/sdc1 /mnt
Error reading bootsector: Input/output error
Failed to mount '/dev/sdc1': Input/output error
NTFS is either inconsistent, or there is a hardware fault, or it's a
SoftRAID/FakeRAID hardware. In the first case run chkdsk /f on Windows
then reboot into Windows twice. The usage of the /f parameter is very
important! If the device is a SoftRAID/FakeRAID then first activate
it and mount a different device under the /dev/mapper/ directory, (e.g.
/dev/mapper/nvidia_eahaabcc1). Please see the 'dmraid' documentation
for more details.

BW-userx · 10-08-2016, 01:43 PM

so what is this trying to actaully tell me?

Code:

[userx@Voided ~]$ sudo dosfsck -w -r -l -a -v -t /dev/sdc1
fsck.fat 4.0 (2016-05-06)
Read 512 bytes at 0:Input/output error

Code:

[userx@Voided ~]$ sudo xbps-query -Rs dosfstools[*] dosfstools-4.0_1 DOS filesystem tools
[userx@Voided ~]$ sudo dosfsck -t -a -w /dev/sdb1
fsck.fat 4.0 (2016-05-06)
Currently, only 1 or 2 FATs are supported, not 0.

BW-userx · 10-08-2016, 01:46 PM

fdisk -l

Code:

fdisk: cannot open /dev/sdc1: Input/output error
[userx@Voided ~]$ sudo fdisk -l /dev/sdc
Disk /dev/sdc: 931.5 GiB, 1000170586112 bytes, 1953458176 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
Disklabel type: dos
Disk identifier: 0x4d6d966b

Device     Boot Start        End    Sectors   Size Id Type
/dev/sdc1        2048 1953458175 1953456128 931.5G  b W95 FAT32

michaelk · 10-08-2016, 03:18 PM

This tells me the MBR is good but the first sector of partition 1 (i.e. 2048) is bad. testdisk and photorec go byte by byte to find files based on their magic number but the file name is lost. Hopefully there are not more bad sectors and you can recover all of your data but it will be painful.

http://www.exampleproblems.com/wiki/...location_Table