I just got a new hard drive for my T60 laptop, so I'm trying to wipe the old 100GB drive before selling it. I did the "autonuke" option in DBAN 1.0.7, and it says the throughput is about 2000 KB/s, and the remaining time is about 69 hours. I've seen other people say the autonuke option takes maybe 3-5 hours. Why is mine taking so long?