Hello,

Yes, it is clear that one can do read-only tests that do not destroy
data.  However, in this case, it seems to me more useful to do
read/write (it is actually write/read) tests as it appears that the
problem is more likely in the write ... 

I have never heard of a non-destructive read/write test, which I assume
reads then rewrites the disk.  Although that is clever and could be
useful, in this case it sounds to me risky on a disk that seems to be
failing.

Best regards,
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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