I have a year old WD20EADS 2TB drive and the current pending sector count was going up.
When I first noticed it using HD Tune Pro, it was at 15 and over the course of a month it steadily went up to 19. I've read somewhere that Zero-Filling the drive fixes it.
So I backed up the data to another drive and used HD Tune Pro to format and zero fill it. It appears to be fixed since the count reset back to 0 and the health is green again.
Though I'm not sure how reliable that is... Should I worry or should I just continue using that drive? How likely is this an indication of imminent failure?