My 500GB HD which is also contains my system partition is being shown at 30% health by HD sentinal pro. I tried Hd regenerator on the disk it said it found only 7 bad sectors which it recovered( compared to 72 by HD sentinal pro) . How reliable is HD regenerator. I know this drive will fail soon and have backed up the data. HD is in warranty period(samsung) what findings are required before I can ask for replacement.