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On Tuesday, 2009-01-20 at 18:29 -0600, David C. Rankin wrote:
filesize? FAT usually limits to two GiB...
Ah, the wikipedia says "4 GiB minus 1 byte (2³²1 bytes)". That's not
enough, a DVD iso image is larger.
Hmmm, didn't think about it from that standpoint. I thought George was
about a size limit for the drive. I overlooked the file size issue. But isn't
that a file size limit that applies to some processes, but not a limit to the
actual physical file size on disk? I'm still fuzzy about that one.
I don't know why there is a file size limit; let me think. It can't be
cluster count, because cluster size varies. Ahhhh! I think know why: the
read functions in MsDOS will be a word, and 2³² is precisely 4 GiB. AH,
reading the wikipedia article, I see more limitation places: the filesize
is stored as four bytes in the directory entry (search for "file size" in
the wikipedia article).
So... it is both a limitation of the filesystem and of the functions used
to read it in Dos/Windows. We are stuck with it, unless they release
another specification, and I think it would not be compatible with
existing tools (changed directory entry format).
Carlos E. R.
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