My SSD show less storage available than he actual have

[LegendEpic]

My SSD storage is actual 80 gb in total. The files i have on it is around 35 gb in total.
I should have around 45 gigabyte free but i have only 15 gigabyte free.
Where is the other 30 gigabytes?
I format the disk the problem is fixed but after few days the same thing happens again.
I think that the problem is the windows update cause it stuck in the midle and after that the disk show me less free space than it actual have.
There is any way or program to help me clean those files or help me find a way to fix that problem?

 

[Rabmac]

Delete all but your most recent system restore.

Goto C:/Windows/SoftwareDistribution and delete the download folder.

This should free up a large chunk of space.

 

[Starcruiser]

If you're running Windows 8 or 10, then right click the start button and select disk management. Everything you need to know is in there as far as what your actual space is.
Keep in mind, manufacturers make their GB claims off of 1000 MB, not 1024. This, combined with space required for formatting and a system drive will make your actual user space much less.

 

[ss202sl]

Is this an OS drive? What about your page file? Hibernation file?

 

[Bezzell]

https://windirstat.info/

 

[LegendEpic]

Is this an OS drive? What about your page file? Hibernation file?

Those hibernation file and page file took me around 10gb and those files are not showed in search.
With a little help from google results i clear them both of them.

https://windirstat.info/

I also found some unkown files who are not public and in total they took me around 12gb from my disk.
Both of you guys find my solution i wish i have double "best solution" button to vote both of you.

Thank you all for your help guys finally i clear my disk and i have some free space again.