Question Missing storage space

bulsoldier

Distinguished
Mar 27, 2012
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18,510
So I have win7 installed on my desktop. It has two storage units, one HDD which is the D drive and another SSD which is the system C drive.

I have no issue with the HDD but the system drive which is 120gb (117 actually). So,when I click properties on the drive itself it shows me the pie graph where it says the total is 117gb of which 93gb are used and 24 are free. However when I go inside C and select everything and check the size it amounts to about 64 gb of stuff. I also selected "show hidden folders" but it only showed about 2-3 gb more.

I am interested where are those 30 or so gb that I can`t see. How can I check if what are they used for and how can I get them back since I doubt win7 and a few programms require 90gb.