[SOLVED] 40 gb of unknown storage

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Solution
Turns out, I have that same thing.

In WinDirStat - Options, Show Unknown was OFF in mine.
Turn it on, and that same <Unknown> thing appears.
Here, the yellow thing at bottom left. Mine is only 12.6GB.

6qupkPT.png


However, a subsequent run of WDS does NOT show it.
t2uF4DS.png


Notice the 'size' of data on the C drive (circled in red) does not change by 12.6GB up or down.


From an older post at WDS:

What is “<Unknown>”?

"This mysterious item is just the difference between what Windows reports as the free space on the volume minus size of the files WDS can access. Please note the...
Aug 6, 2020
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I'm not convinced this is actual unsusable space.
I'd try filling up that 200GB partition, with a reboot or two in the process.

It is showing ~80GB free space. I'd find 90-100GB of random files, and copy that to this partition. See what happens.
i checked another pc and it too has about 30 gb of unknown space maybe it's supposed to be like that
 
Aug 6, 2020
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Right.
My pic above shows 12.6GB of that, and on the second run...none.

It is just data that WinDirStat can't categorize, hence <Unknown>. Space Windows uses in the background, as space is available.
i tried creating a 100gb test file in C drive and it says it doesnt have enough space but a 80gb file works