I found out that it is mainly "System" (in a process from 0,1Mb) that's accessing the HDD for nearly 100 to 100% :)
It's very anoying, I cannot disable it and WIndows stalls very often...
I've never had this problem untill i installed Windows 8 Pro (64bit)
A quick google for "Windows 8 hdd 100%" and you find that this problem is like a rash.
1000's are suffering. The trouble is that there doesn't seem to be any one thing causing it.
I've had this problem and resolved it 3 times with completely different causes each time and today is came back arggh!!
Anyway if it might help you my first three experiences were solved using xperf to trace the problem through the IO stack. There is a great tutorial here
Using Xperf to investigate slow I/O issues - Ntdebugging Blog - Site Home - MSDN Blogs
My first 3 solutions (in chronological order) were
- Remove the Intel storage driver and revert to Microsoft generic as there was a bug in the early release of x64
- Revert to an earlier NVidia display driver as a bug caused Win x64 to continuously rebuild it's driver catalogue not only thrashing the HDD at 100% but also making space magically disappear (that bug has now been resolved and you should update to the
latest version)
- Remove AVG as their early version for Win 8 caused this to happen on a small number of systems (not sure why but apparently Avast had the same issue, again only early versions and only a small number of poeple)
I also found a LOT of posts about people with SSD's claiming that disabling write caching resolved this bug for them on the SSD (I did this and my SSD performance improved so there is something to it)
Finally, I saw one post about someone with a corrupt download folder for Windows Automatic update. Purging it and setting update to manual solved the problem for him. After installing updates he was able to go back to automatic so perhaps check your update
history for any failed updates and if you have some follow those steps.
Good luck!
And if you find any other solutions please let me know because I'm going insane now that this has returned for me a fourth time!!