Re: [gentoo-user] [OT] Badblocks on my harddisk

[Mick <michaelkintzios@gmail.com>]

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On Saturday 26 Jul 2014 02:49:15 meino.cramer@gmx.de wrote:
> Hi,
> 
> After running smartctl for an extended offline test I got
> a badblock (information extracted from the report):
> 
> SMART Self-test log structure revision number 1
> Num  Test_Description    Status                  Remaining  LifeTime(hours)
>  LBA_of_first_error # 1  Extended offline    Completed: read failure      
> 90%     14460         4288352511 197 Current_Pending_Sector  0x0032   200 
>  200   000    Old_age   Always       -       1
> 
> I found a explanation to map the LBA to a partition here:
> http://smartmontools.sourceforge.net/badblockhowto.html
> 
> My partition layout is:
> #> sudo fdisk -lu /dev/sda
> 
> Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 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: 0x07ec16a2
> 
> Device     Boot      Start        End    Blocks  Id System
> /dev/sda1  *          2048     104447     51200  83 Linux
> /dev/sda2           104448   12687359   6291456  82 Linux swap / Solaris
> /dev/sda3         12687360  222402559 104857600  83 Linux
> /dev/sda4        222402560 1953525167 865561304   5 Extended
> /dev/sda5        222404608  232890367   5242880  83 Linux
> /dev/sda6        232892416  442607615 104857600  83 Linux
> /dev/sda7        442609664  652324863 104857600  83 Linux
> /dev/sda8        652326912  862042111 104857600  83 Linux
> /dev/sda9        862044160 1071759359 104857600  83 Linux
> /dev/sda10      1071761408 1281476607 104857600  83 Linux
> /dev/sda11      1281478656 1491193855 104857600  83 Linux
> /dev/sda12      1491195904 1953525167 231164632  83 Linux
>                 4288352511  <<< The number reported by smartctl
> 
> 
> Following the linked document...
> It seems the bad LBA is not on the checked harddisk.
> 
> Or (more obvious) I did something wrong...

You are probably comparing different units.  The Start and End of fdisk are 
reporting sectors, each sector being 512 bytes.  Therefore if the LBA is 
reported by smartctl in bytes, you have:

4,288,352,511 ÷ 512 = 8,375,688.5

which would place it within your swap partition.

I would do this:

 swapoff /dev/sda2

 dd if=/dev/zero of=/dev/sda2 bs=512 conv=notrunc

 mkswap -L swap -c /dev/sda2

 swapon /dev/sda2

and hopefully the problem will be gone when you run the next smartctl test.

-- 
Regards,
Mick

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