Last year I was upgrading the software on my My Book for Mac and something went wrong and the upgrade quit leaving me with an external HD that no computer can find. When it’s connected to all my computers it never shows up, not on the desketop nor on the Disk Utility. I assume everything is gone on the HD, which is ok because everything was backed up. But is there any way to reinstall software onto the HD so I can use it again? It would be nice to have another HD to use as a back up. I don’t see how, though, since it’s like the HD doesn’t exist when it’s connected to a computer.