Stefza :
So basically I've had this laptop for 2 weeks now and I'm having issues with the Disk Usage. The laptop was okay before the recent big windows update but now it isn't. On start-up the Disk Usage is through the roof at 100% for some length of time. After a while it does go back to normal but at random times it shoots back up. I can't pinpoint what the problem is because the read/write looks normal to me, nothing is over using the disk. I've tried many fixes, such as disabling Superfetch and Prefetch. I've also disabled Services like Windows Search ect and even changed my virtual memory. Nothing works. I will attach a screenshot of Task Manager and Resource Monitor.
http://i.imgur.com/1cjJ4Xw.png
This is a common issue with windows 10
You can disable superfetch and windows search
Sometimes windows search loops causing it to take up all the disk memory.
to temporarily disable windows search upon the command menu by searching "Cmd" in Cortana; RIGHT CLICK cmd and choose run as administrator.
After which enter this command (You can copy paste it)
net.exe stop "Windows search"
To permanently disable Windows Search open RUN (Press Windows Key + R) enter services.msc and click enter
In the services menu that opens scroll down to windows search right click it and under "startup" choose disabled, click applied and that's it.
Task manager should go down from 100% to a more realistic number.
Source: http://www.makeuseof.com/tag/4-tips-fix-100-disk-usage-improve-windows-performance/
I know because: Same thing happened to me and I googled it until I found an answer