It is very annoying when a disk with the production date of January 2011, after two days, of which it has been used almost 8h, defective. The defect manifests itself by a clunk. So far I have had very good experience with Samsung hard drives - eight boards I have for a long period in operation (HD501LJ and HD103SJ) without a loss. This defect must not happen really - maybe this is due to poor packaging as sent Amazon disks. I guess I'm going to buy my next plate again at a shop on site.