Re: "But I never experimented on a live system again"
Is it that suspect? The output from the formatter was very unclear, simply asking for a drive number. It did not explain its purpose. If that was normal, it is entirely possible that the expected utility wasn't clear either. Maybe it would have asked for a drive on multi-drive systems before going to the interface with which Adrian was familiar, which he had not seen because previous systems either had one drive or had a utility that figured it out. It seems like a bad process for displaying information to the user, but given that, I can understand getting it wrong.