USB mass-storage devices and READ CAPACITY(16)

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As we can see from recent bug reports, a lot of USB mass-storage 
devices cannot handle READ CAPACITY(16) commands properly.  They send 
back garbage and are unusable as a result.

Should we go ahead and set a flag on all these devices, telling the sd 
driver to try READ CAPACITY(10) first?  That's a lot easier than adding 
more and more entries to unusual_devs.h.

Alan Stern

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