Cause that stupid program called Windows Media player and that bad feature in Sync. For update music/video files i've already selected into my library.. The feature keep updating those files ones and again.. Many times at the minute also spent a lot of load CPU.. Finally my hard disk gave up and stopped working at all within two weeks since i've installed Windows 7.. so please be careful for any stranger load at your CPU or HDDs either if you heard any stranger sounds.
Another problem that called "Index files" on the search engine of windows.. Be careful of selected "add to be indexed" so will take several times to discover all of your files.. And for my personal situation when you have a LOT and a LOT of rubbish and old files it will spend your HDD health and makes it so hard work which will give you decreases in its life
Just prayer for me to be this problem on its IC Board of my HDD!
- My drive show me in the bois it has 15GB with unknown code (it was WD 200GB) without any ability to boot from or check out in another OS