[kwlug-disc] Media errors on a USB disk

Bob Jonkman bjonkman at sobac.com
Thu Oct 21 17:03:14 EDT 2010


Run it again, and see if there are any errors remaining.  If so, it's 
either 1) because this tool can't fix those errors or 2) they're errors 
that were uncovered after the first set of errors was fixed.

If 2), then keep running the utility until there are no more errors.

I would also recommend that you pop the drive out of the external case 
and attach it to an internal bus, IDE or SATA.  Much faster, and, I 
believe (for no good reason) more reliable.

--Bob.

On 10-10-21 09:43 AM, Khalid Baheyeldin wrote:
> So I ran the command that Andrew Cant suggested.
>
> Since this is on a USB connected drive, it took from noon till sometime in
> the early morning (was running overnight).
>
> Here is the output:
>
> # e2fsck -c -y /dev/sdb1
> e2fsck 1.40.8 (13-Mar-2008)
> Checking for bad blocks (read-only test): done
> /dev/sdb1: Updating bad block inode.
> Pass 1: Checking inodes, blocks, and sizes
>
> Running additional passes to resolve blocks claimed by more than one
> inode...
> Pass 1B: Rescanning for multiply-claimed blocks
> Multiply-claimed block(s) in inode 24584: 22130688 22130721 22130722
> 22130723 22130724 22130725 22130726 22130727 22130729 22130730 22130731
> 22130732 22130733 22130734 22130735 22130737 22130738 22130739 22130740
> 22130741 22130742 22130743 22130745 22130746 22130747 22130748 22130749
> 22130936 22130974 22131744 22131747 22131928 22133456 22133467 22135184
> 22135188 22135376 22135425 22135608 22135662 22135663
> Pass 1C: Scanning directories for inodes with multiply-claimed blocks
> Pass 1D: Reconciling multiply-claimed blocks
> (There are 1 inodes containing multiply-claimed blocks.)
>
> File blahblah (inode #24584, mod time Sun Oct 17 03:33:27 2010)
>    has 41 multiply-claimed block(s), shared with 1 file(s):
>          <The bad blocks inode>  (inode #1, mod time Wed Oct 20 13:14:45 2010)
> Clone multiply-claimed blocks? yes
>
> Error reading block 22130726 (Attempt to read block from filesystem resulted
> in short read).  Ignore error? yes
>
> Force rewrite? yes
>
> Error reading block 22130727 (Attempt to read block from filesystem resulted
> in short read).  Ignore error? yes
>
> Force rewrite? yes
>
> .... repeated for more blocks
>
> Pass 2: Checking directory structure
> Pass 3: Checking directory connectivity
> Pass 4: Checking reference counts
> Pass 5: Checking group summary information
> Free blocks count wrong for group #1 (30161, counted=30120).
> Fix? yes
>
> Free blocks count wrong for group #675 (65501, counted=6).
> Fix? yes
>
>
> /dev/sdb1: ***** FILE SYSTEM WAS MODIFIED *****
> /dev/sdb1: 41454/61054976 files (1.5% non-contiguous), 86353980/244190008
> blocks
>
> The file that is mentioned in the output is the previous backup, so
> eventually it will be overwritten. If that procedure got all the bad blocks,
> then the problem should go away.
>
> During that time, dmesg shows messages like these:
>
> [2731049.634591] Buffer I/O error on device sdb1, logical block 22130726
> [2731049.634602] Buffer I/O error on device sdb1, logical block 22130727
> [2731049.634609] Buffer I/O error on device sdb1, logical block 22130728
> [2731049.634615] Buffer I/O error on device sdb1, logical block 22130729
> [2731049.634621] Buffer I/O error on device sdb1, logical block 22130730
> [2731049.635133] Buffer I/O error on device sdb1, logical block 22130731
>
> And this:
>
> [2731055.768360] sd 13:0:0:0: [sdb] Result: hostbyte=DID_OK
> driverbyte=DRIVER_SENSE,SUGGEST_OK
> [2731055.768365] sd 13:0:0:0: [sdb] Sense Key : Medium Error [current]
> [2731055.768368] sd 13:0:0:0: [sdb] Add. Sense: Unrecovered read error
> [2731055.768371] end_request: I/O error, dev sdb, sector 177083401
> [2731056.763272] sd 13:0:0:0: [sdb] Result: hostbyte=DID_OK
> driverbyte=DRIVER_SENSE,SUGGEST_OK
> [2731056.763277] sd 13:0:0:0: [sdb] Sense Key : Medium Error [current]
> [2731056.763280] sd 13:0:0:0: [sdb] Add. Sense: Unrecovered read error
> [2731056.763283] end_request: I/O error, dev sdb, sector 177085297
> [2731057.667254] sd 13:0:0:0: [sdb] Result: hostbyte=DID_OK
> driverbyte=DRIVER_SENSE,SUGGEST_OK
> [2731057.667259] sd 13:0:0:0: [sdb] Sense Key : Medium Error [current]
> [2731057.667263] sd 13:0:0:0: [sdb] Add. Sense: Unrecovered read error
> [2731057.667265] end_request: I/O error, dev sdb, sector 177085305
>
> Any comments?
>
>
>
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