Disk cleanup overstating/overcleaning reclaimable space

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Had a friend reach out with this one and thought I’d ping here to see if anyones heard of it.

 

“I went to clean up my virtual machine…it’s about 2TB, and it showed 400GB of reclaimable space.  When I did the cleanup, windows wouldn’t boot because it was corrupt and a lot of data was lost.  Fortunately it wasn’t an important VM, so I just deleted and recreated, but now I’m not sure I trust the cleanup function anymore.”

 

He didn’t save logs or anything, but does anyone have an inkling of what happened?

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