[netrus]

But you can't see from the outside if the drive was wiped. How can I be sure that I do not mix up the to-be-wiped and the wiped drives with 99.999% accuracy? That I did not unplug the drive before the whipping was finished? It's much easier with physical destruction.

[Gordonjcp]

This is about the only valid objection in all the replies to my post.

You're bang on - you might not know it's been wiped.

99.9999% of people will never need to care about it that much.