100MB&#x2F;s * 60 seconds * 60 minutes * 24 hours = 8,640,000MB (or 8.64TB) per day<p>That makes sense because I have performed 7-pass wipes on 1TB hard drives and it took just about 24 hours (not my decision to do 7 passes, but a customer requirement)<p>Of course it&#x27;s going to vary based on the drive and how far away from the center of the drive the tracks are, and some high performance platter drives have benchmarked at 200MB&#x2F;s.