Ok I have a similar problem. My netbooks hard disk shows error when I am on Ubuntu. The Windows CHKDSK doesn't show any errors. I get CRC errors when I download lot of file in the utorrent.
Called Samsung guys and they told that they will only check with the samsung diagnostics stuff. Of course thats of no use.
I have already ordered WD Black 320GB for my netbook. Will take out the stock disc and use it as my external disc. Can't rely on the old disc and the samsung guys.