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Evan Gibson wrote What if someone packed their database and then did heaps of changes so that the size was bigger than it was before the packing?

You'd have to add extra checking that, if it was bigger, the first "size" bytes are the same in both files.

ooo. nasty. hm, ok, so I need to check for the datestamp on Data.fs.old Or maybe md5sum the bytes... hmmmm. Anthony