Question: 7 + 7 < 14?


New Member
Hello, hope no one's asked this before.

Let's say that I make an "Erase Unused Disk Space" with 7 passes today, and when it has finished, start another run at the same drive with 7 more passes. Does that equal a scenario where I perform 14 passes at the same time?

Since the authors are speaking about their extra sophisticated overwriting methods, I figured that a 14 pass shred perhaps is mathematically more secure than two consecutively performed shreds of 7 passes each.

Reason I ask is that if 7 + 7 equals 14, I can do one shred today, and another shred tomorrow, achieving the same security as if I made 14 passes today (a time-consuming task).