I'm only a little bit computer literate. I've never really put forth any time to studying these things. I pretty much learn by troubleshooting problems as they appear. Anyway... I was having computer issues, ran a hdd diagnostic, reallocated sector count below theshold. From what I gather that means the hdd is pretty much done for. No biggie, I'll get a new HDD. But before I pack the old one into a box, I want to write zeros through the drive. I've got everything off it I need and don't want to risk somebody else getting something off it I don't want them having. I'm using WD's diagnostic tool and it's estimating that it will take 43 hours to do a full erase. I did a quick erase and it took less than 10 minutes. Is that normal?