Re: USB HD: No Sense / Info fld=0x0 and read corruption

[Ludovico Cavedon <ludovico.cavedon-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Alan Stern wrote:
> On Wed, 24 Dec 2008, Ludovico Cavedon wrote:
>> My question is: how can this happen? and not just one sector, but at
>> least a dozen!
>> Bad HD? (it's new! 93 hrs of activity so far!)
> 
> Maybe you can exchange it...

Definitely!

>>> It would also help to know what happens under Windows.  Do the same 
>>> "empty sense" errors occur?  If they do, how does Windows handle them?
>> I can try to use usb snoopy to log usb traffic under windows.
>> Do you know how I can ask Windows "read sector X"?
> 
> I wish I knew!  Perhaps Microsoft's KnowledgeBase site can tell you 
> how.

I found a free tool to read a raw sector of a partition (NT Disk
Viewer). Unfortunately USB Snoopy kept stopping capturing packets after
a few seconds, so I was not able to see what was happening.
Anyway, I goi a read error ofter a while the program seemed frozen. So I
guess Windows is handling them retrying to read the sector and finally
giving up.

A question:
If I rewrite these sectors I can fix these errors (at least
temporarily). I also noticed that when the "check condition" bit is set
some data is also tranferred. Is there get these partial data (e.g. with
dd)?

Thanks,
Ludovico

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