Before you tell me this is not a Windows 8 issue but the software I use and how I use it, I need to clarify.
When I was using Windows 7, I monitored the written bytes to my SSD drive because I was worried about write cycles. I learned to forget about it and just use the disk and don't bother with stuff like moving the Firefox profile and cache to an HDD, which kind of kills the whole purpose of having an SSD. Anyway, after using the computer for a whole day, both me and my brother, the amount of written bytes to C: wasn't too big - around 1GB, sometimes more, sometimes less. This is without modifications to software - no Mozilla profiles, pagefiles, etc, were moved to HDD.
Now on Windows 8 it's a little weird. After a day of computer use (8 hours or more), I have between 6 and 11GB written to C:! I don't use too much applications - it's pretty much Firefox, an instant messenger, foobar, Gimp... there's just no way anything should write THAT much to the disk.
I tried running procmon, filtering the results by written files or filtering by C:\, but during monitoring there was almost nothing written to the disk. After using Firefox for a while, I check the written bytes and... additional 6GB suddenly have been written. So I moved the profile and cache folders to HDD, to see if it changes anything, but it did not, so I went back to using the SSD for them. My research was fruitless. I could not identify what is writing so much data. Firefox and the People app wrote the most, likely because of storing web cache on the disk, but the amount of these writes is very small and should never reach over 10GB within a few hours.
I use DiskCountersView to monitor the amount of read and written data. For a second, I thought this program might not be compatible with Windows 8 and show weird stuff because of that, but a friend of mine does not have this issue. He has about 1GB written, after a few hours of browsing the web, watching movies, etc.
I have scanned the whole system with the built in Defender, Malwarebytes Antimalware, SpyBot and they didn't even find something suspicious. The system is 100% clean. The situation did not change after reinstalling the whole system from scratch (due to other reasons). I don't use hibernation, only fast boot. System Restore very rarely creates new restore points and I doubt they would be big enough to generate over 10GB's of data.
So I ask here
Is this normal for Windows 8 to write so much to the C: partition? If so, why?
If it is not normal, then do you have any recommendations about how should I investigate further? I know this amount of writes won't suddenly kill my SSD (or at least shouldn't
) so I could probably forget about it, but putting SSD life expectancy aside... what could possibly be in those tens of gigabytes?
Thanks in advance for any tips.