Hard Disk Monitoring

Thank you for your very detailed and informative response. At this time there are no other problems with the drive and I will check the links you provided.

I have a Seagate 1 TB drive (ST31000528AS) that, I believe, has ~2 billion sectors. If that's the case, why does an 11 bad sectors count reduce health dramatically to 83%, as reported by HDS 4.30 ? Mathematically, that just doesn't make sense to me. You'd think that it would be a very small fraction...