Re: smartctl reports bad sectors, badblocks does not find any

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On Thu, 23 Dec 2010 20:04:22 -0500, Ted Roche wrote:

> On 12/23/10, Juan R. de Silva <juan.r.d.silva@xxxxxxxxx> wrote:
> 
>> I did the stupidest thing I could as to forget that I was running on
>> battery while installing FreeBSD on a free (1st) partition. and I found
>> the laptop shutting down when it was too late.
> 
> This shouldn't have caused hard disk drive damage; modern hardware
> should be smart enough to shut down safely on power failure.

You may be right. It is very much possible that I had some bad sectors 
before and did not noticed them.  It does look like there were just few 
of them and they were managed by hardware. At least neither of my Lunux 
OSs never thrown any related errors.

I was not sure myself but I've noticed the problem after the described 
accident.  Hence the blame...

> I haven't used badblocks, but suspect that the hard disk drive
> electronics is clever enough to hide damage and relocate bad sectors.
> The S.M.A.R.T. electronics will still know they are there, though.

OK. This might be the answer to a question I had: why badblocks never 
found them but smartctl did.

> I have had some success recovering disk errors following the guidance
> here:
> 
> http://smartmontools.sourceforge.net/badblockhowto.html

I have actually followed the same howto without any success. After 
completion of all suggested steps I still had them reported by smartctl 
at the same place. But keeping in mind suggested by you above, this might 
be because the author of the howto dealt with bad sectors of logical 
nature rather then hardware nature.

Thanks for suggestions.

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