I don't know about any reports but here's what I did: My PC after sitting idle would start to grind away on the hard drive for no apparant reason. As soon as I moved the mouse to open something it would stop. I opened up task manager and chose the processes tab, then I sorted by CPU utilization with the highest at the top. Let the PC sit for awhile until hard drive started grinding again. Then I simply checked the process that was cruncing the CPU, googled it, and discovered it was just a defrag process running. Sorry I don't remember the exact name of the process.
"Once you can accept the universe as matter expanding into nothing that is something, wearing stripes with plaid comes easy"
Albert Einstein