This year I upgraded my 500 GB hard disk to 1000 GB (both from Seagate). At that time I was on Windows 7. Everything worked without troubles.
Now I upgraded to Windows 8, with all latest updates.
When I turn on my computer I can see a lot of workload on my hard disk. Sometime it's using 100%.
I don't know what it does since I never run any data-intensive apps. I use Visual Web developer and some browsers like Google Chrome, Firefox, as well as Sumatra PDF or VLC.
How can I find out what makes my computer use the hard disk so much?