windows 8 disk usage 100%
and task manager showing 100% disk usage
follow these steps
1. Clear Your Browser Cache
2. Close the Firefox Browser, in my case it will calm down the PC
3. remove all temporary files by using disk cleanup tool in windows
Reasons: Sometimes during windows updates are being downloaded , it may shoot up the disk usage,
and 2nd thing is even during browser updates it take so much drive resources, its a bug and i hope MS will resolve it
if it help you to resolve the issue plz post a comment