On 06/30/2014 10:35 PM, John Stoffel wrote:
> Kern> Yes, it is clear that one can do read-only tests that do not destroy
> Kern> data. However, in this case, it seems to me more useful to do
> Kern> read/write (it is actually write/read) tests as it appears that the
> Kern> problem is more likely in the write ...
>
> Absolutely. And hopefully, this way you don't corrupt the existing
> data on the disk, but you do force the disk to do a low level
> re-allocation of bad blocks and sectors. But if you are seeing bad
> blocks on the disk, then it's time to start thinking about retiring
> it.
Hmm. I learn something new every day; re-allocation of bad blocks. That
sounds very interesting. Thanks for the information, it could be very
useful for situations like this.
Best regards,
Kern
>
> Kern> I have never heard of a non-destructive read/write test, which I assume
> Kern> reads then rewrites the disk. Although that is clever and could be
> Kern> useful, in this case it sounds to me risky on a disk that seems to be
> Kern> failing.
>
> Kern> Best regards,
> Kern> Kern
>
> Kern> On 06/29/2014 09:04 PM, John Stoffel wrote:
> Kern> 3. Run read/write disk tests on your USB disk (note: this will
> Kern> destroy any existing data).
>>> This isn't quite right. You can run read-write tests on a quiescent
>>> filesystem (ie unmounted) without problems:
>>>
>>> badblocks -svn /dev/sd?
>>>
>>> will scan the entire disk using non-destructive read-write mode. But
>>> as Kern said, check your logs as well.
>>>
>>> John
>>>
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