BEWARE!!! The hard drive with the recordings will only work on the TiVo they were recorded on. Plugging the hard drive in another TiVo will not keep the recordings, and you will end up loosing the recordings. You need to transfer the recordings through the TiVo or TiVo online to retain any recordings.2. I'm going to swap my hard drives between the two Edges to retain my recordings. Does anyone know where I can purchase the special Tivo screwdriver?