Re: [PATCH] Forcing SCSI capacity for broken SD Card readers

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On Sun, 20 Dec 2009, Clemens Fruhwirth wrote:

> On Wed, Dec 16, 2009 at 8:43 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
> 
> > Isn't just changing a block device's size at random times a bad thing
> > to do?  The size gets used a for a bunch of different things (checking
> > partition boundaries, validating I/O block ranges, and so on).
> 
> Forcefully extending partition boundaries and I/O block ranges was
> just what I had in mind. My card reader was listed as being compatible
> with card >1GB, and I suspected that this was only verified under
> Windows. I knew that Windows believed in the partition table more
> strongly than into device boundaries, so I figured that would probably
> work. And it did.

Just out of curiousity, what happens if you try to repartition and
format a card using this reader under Windows?  Does it restrict the
total available size to 1 GB?  If it does, doesn't that indicate the
reader _isn't_ compatible with large cards?

Alan Stern

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