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I've got a truly humongous file that I want to split (~500GB) and only 200GB of free space left. I obviously can't split it the conventional way, with 7zip or any other splitter utility I've been able to find, because that makes a copy as it goes, which would fill up my drive. Is there any program or nifty script out there that can split a file while erasing the original data at the same time? I do not have a HDD or any other really hefty external storage medium apart from some wimpy flash drives and DVD-RWs.

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You might try dd. There is a windows port of it in the gnuwin32 core utils ( and an explanation of splitting and merging files here:… – MaQleod Mar 4 '14 at 0:18
Wow, thanks! That seems like it does basically exactly what I want, though it is a bit confusing – user304809 Mar 5 '14 at 3:24

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