Re: [usb-storage] [PATCH]indistinguishable devices with broken and unbroken firmware

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On Wed, 7 Feb 2007, Oliver Neukum wrote:

> Am Mittwoch, 7. Februar 2007 16:05 schrieb Christoph Hellwig:
> > On Wed, Feb 07, 2007 at 03:22:39PM +0100, Oliver Neukum wrote:
> > > Hi,
> > > 
> > > there's a USB mass storage device which exists in two version. One
> > > reports the correct size and the other does not. Apart from that they
> > > are identical and cannot be told apart. Here's a heuristic based on the
> > > empirical finding that drives have even sizes. I know it's ugly, but it fixes
> > > an ugly bug.
> > 
> > Do we really need a second flag?  Alternatively fix_capacity could be
> > changed to mean fix size if odd.
> 
> Until we learn about devices which really do have an odd number of sectors.
> And then we'll have a problem. I'd like to avoid heuristics when we know
> for sure.

In fact there are devices which have an odd number of sectors.  I once 
thought that would be a good heuristic to apply to all devices, but it 
won't work.

Alan Stern

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