Apparently conflicting smartctl output

[Bas Smeelen]

On 01/06/2012 04:37 PM, Warren Block wrote:
> On Fri, 6 Jan 2012, Bas Smeelen wrote:
>
>> On 01/06/2012 03:39 PM, Warren Block wrote:
>>> On Fri, 6 Jan 2012, Bas Smeelen wrote:
>>>
>>>> I have had this with a drive and multiple read errors would not 
>>>> remap the
>>>> sector.
>>>> With write errors the sector would be remapped. This was a new Samsung
>>>> laptop drive though, not a Western Digital.
>>>
>>> That's standard.  Sectors are only remapped to spares on a write error.
>>>
>>>> To get the sector remapped I had to fully write the drive and it 
>>>> was ok
>>>> after that.
>>>
>>> Just writing to the sector should be enough.  Of course, when one 
>>> sector
>>> goes bad, others often follow.
>>
>> I just hope it does not develop more bad sectors.
>
> That's the worrying thing.  Was it just a loose flake of oxide, or was 
> it a strip that peeled off the disk?

No way to know I guess
>
>>> From what I read on the "Bad block HOWTO for smartmontools" on 
>>> sourceforge
>> it's not trivial to just write to that sector and also it would 
>> destroy the
>> filesystem?
>
> Finding the right block may not be too hard.  /var/log/messages should 
> show the block number, but then I don't know what tool is available to 
> write to that specific block.  Tools like that are not common because 
> generally, growing bad sectors means the drive is starting to fail 
> anyway.

I could use dd if=/dev/random of=file seek=blocks_to_skip bs=100M the 
next time

>
>> So I just copied a big iso file several times untill the sector got
>> remapped, the disk was almost full then.
>> This is a brand new disk, maybe I should return it under warranty then,
>> though it did not develop more bad sectors?
>
> If possible, yes.  It already lost some data.
>

I'll talk to the supplier anyway when more bad sectors occur
Cheers



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