How can I get a summary of my disk usage. It says USED = 100gb I can find 40gb usage?

[Zen11]

Hi, my laptop is for study. I want to down load new study files

Window properties states 

USED space of 100 gb

Free space 17.7 gb 

I cant find any more than 40 gb used as below - Where can the other 60gb be? 

Documents 6gb 

Desktop 1.03 gb 

Pictures 2.1 gb

Videos - NONE 

Program files - 4.23 gb 

Program files (x86) 1.42gb

Windows 20gb

File called P00ULZ.B2B = 768mb

Thank you for any info. Have a good day!

[Dragon-Fur]

@Zen11 

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Visual Representation of the disk(s) installed in your computer

Open File Explorer > This PC

Tab View > Tiles

Right-Click on one of the Devices and Drives > Properties

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Tree Size Free

Tree Size free is one of a number of "space counters" that you can use to check how the space on your computer is used.

You can select most any folder to start the search - from "C" disk and anything under it, for example.

The search is fast, too, and provides data in easy to read format.

Once installed, Tree Size is added to your "Right-Click" menu to make it easy to find, select, and check a folder on your system.

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