How to open disc space

Win 7 / pc

Last night I did a big spring cleaning & transferred a ton of video, music & image files to my external HD.
When I check my disc space, I see that I have 112 GB out of 446GB. (I was down to only around 53 GB) So nice improvement- But...

What exactly is taking up the other 300+GBs? Undoubtedly stuff I can't see, but I have no clue how to clean it/ make room.
I Googled around & saw terms like "shadow copies", etc.

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In Windows Explorer

type in Disk Cleanup and probably gain some more GB's , it gets rid of old junk files and such, after that defrag if you have a HDD

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Did it

Forgot to mention I did Disc Cleanup too. There was nothing that I saw that was close to over 300GB taking space.
I know there's a free app you can download that shows you exactly what it is that's taking your space, but I found it complicated to navigate.

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Did you look at say

"System Volume Information"?

That's a folder too that many don't see. Try the TREESIZE program too.

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Got it

Found & accessed the SVI folder & cleaned it out, thanks in part to TREESIZE.
Got a nice 331 GB (out of 446) of free space now.

Though in order to do that, I had to (temporarily?) disable the system restore setting. I don't think I want to keep that disabled though. If I enabled it again, would the newly freed space remain?

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Most folk toggle it off then on.

That way it cleans up and on restart it makes a restore point.

I'll keep this short as there is so much written about this. And yes.

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If I enabled it again, would the newly freed space remain?

At first most will but as more restore points are added the space will refill.

You can control the maximum size of svi if you want.

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