In my rush to open up my external hard drive from the packaging I cut something that should never had been in a path of danger. Should I have been more careful—probably? But surely it would have been easier and smarter to place the cables on the sides rather then one of the ends? The good news is that I didn’t end up needing that usb head. The cable had three heads so the other two worked out fine. I guess the take away is that if wires are involved with an envelope it’s best to be really careful and not get too excited with scissors.