Weird file size. Explanation please

[Stanimir Parvanov]

Hi I just noticed something weird. When I open This PC the label under drive C:\ says 158 GB free of 249 GB, so that adds up to 91 GB used. When I select everything(including hidden files and folders) in drive C:\ and go to properties I get this

Size - 103 GB, Size on Disk - 54,6 GB... what's going on.
BTW, this is Windows 8.1 on an Acer V15 Nitro, VN7-571G-529Z

 

[SortNVF]

http://www.howtogeek.com/180369/why-is-there-a-big-difference-between-size-and-size-on-disk/ Explains how size on disk can be way more than actual size.
But from the looks of it.. Hmm drive compression active?

 

[Stanimir Parvanov]

Nope