On 2011-03-14 18:37 , Bruce Walker wrote:
On 11-03-14 5:21 PM, steve harley wrote:
On 2011-03-14 14:54 , Bruce Walker wrote:
Now if a bad block is discovered on your Flash device while trying to
read the directory structure, I assume that the bad block will
immediately be remapped, but the damage is already done. Not physically
damaged of course, but files could appear to be unreadable, contain
holes, etc. The fix is to format the card and that will replace the
directory structure. Life goes on.
formatting won't fix a bad block, the image file that is thus
"damaged" should just be deleted
Steve, I didn't say that. I said that formatting would fix a screwed-up
directory structure (and/or files) caused by their having been a bad
block in the directory structure itself. The odds of that happening are
relatively high because the directory structure is updated for very many
file operations, like opening and closing them.
makes more sense when you say it that way -- it sounded like a different
claim when i read "contain holes" (i.e. the remapped block is in a file)
followed by "the fix is to format" -- yes, some blocks used for the
directory are written fairly often (though not necessarily when opening
a file)
of course reformatting frequently will increase the number of writes of
those directory blocks, and thus wear those blocks out even faster
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