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It uses FindFirstFile etc https://github.com/seanofw/spacemonger1/blob/6a41c012534b170...

I thought you meant the $15 utility from Stardock, but if not then I'm fairly confident it's not reading the MFT.

https://github.com/seanofw/spacemonger1/blob/6a41c012534b170...

It's still interesting that they got it to work as fast and precise as they did.

Just learned that its open source now https://github.com/seanofw/spacemonger1

Been using the portable version of 1.4 for decades after first coming across it in some PC magazine or something like that many years ago. Not terribly pretty, but it does what I need and it still works.