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The software we use at my shop is able to detect file types even if the partition info is lost... The way a HD stores its info, the files are all scattered around and there is a master table that explains to the computer what the files are and where. If this is lost, then even though the files are intact the computer has no way to know what is what or where to find it and your drive looks empty or full of gibberish. The data recovery programs can then sift through everything and say "oh hey, this is a .jpg", even though they have no way of knowing what file it was. Sounds like thats what you have.
A side effect of this process is that lots of times some info is improperly interpreted which produces big (or small) garbage files that the program thought was supposed to be a particular file type but really wasn't.
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Anamnesis
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