What the heck is my SSD doing?
This morning, I woke up, turned on my computer, did a bit of web browsing, and shut it off before I left, as I intended to add some more ram and switch from a DVD to a blu-ray drive when I got home, which I did. When I left, I had about 18-20gb free on this thing, but after I finished monkeying around with it I fired it up and now I've only got 7.5gb left. I ran a virus scan and defragged it, but that didn't help much. I checked the properties of each folder listed on C, and by that math I only come up to about 90gb (that's including hidden folders). Where'd this extra space go?
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Check your temp file folder?
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edit- to clarify, my other HD and the blu-ray are showing up just fine. It's only the SSD that's missing.
Did you now....
Anyways as to the actual question it's probably your pagefile. Windows by default makes a pagefile that's something like 1.5x the amount of ram you have installed so that it can dump the ram to your ssd when you go to sleep, and put it back when it wakes up. You increased the amount of ram and windows dutifully increased the pagefile. I don't remember where it is exactly but you can set the pagefile to whatever you want pretty easily, or just turn it off all together if you don't want to hibernate.
Edit - Also yeah you shouldn't defrag an ssd. No worries for doing it a few times though.
The pagefile is not used for hibernation. That's the hiberfile. Do not mess with your page file. Leave it set to let Windows manage it. There's no reason to disable your pagefile.
Sorry I sometimes swap these two, but you can pretty safely alter either. Like you said, hiberfile is the one I was talking about and if you don't ever put the computer to sleep then you can set windows to never hibernate and it will go away. Pagefile, which is the one that the OP seems to have changed is your virtual memory. If you've got limited RAM you need some virtual memory to even be able to open more than a few programs at once. If you however have 8GB+ of RAM you can safely reduce the pagefile to 500MB or so (the last little bit just being used for crash reports). If you seem to have trouble with programs giving you an error pertaining to not having enough memory space then increase the pagefile again.
Other than that, you might want to look into programs that visually display hard drive space, so you can find what is using all of it. There are many of these, I tend to use http://windirstat.info/index.html myself.