Yesterday I turned my laptop on and it worked fine as usually. The problem happend when I turned it on about an hour ago when I heard not that usual sound from HDD. To be sure I downloaded HD Sential and it says my HDD Health=27%. Just two days ago I tested it and it was 100%. I really think that until now it was on 100% all the time and I can not understand how health drop could be that huge in period of couple of hours.