Our old Series 3 TiVo was finally deactivated yesterday. It had an external 1T drive attached to it and we'd like to move it over to the new PRO. My question is, will the recordings that are currently on the PRO remain there? Or do we lose everything by attaching the drive? We no longer have the original instructions (the drive is a few years old), so I'm not even sure what the procedure is for attaching it.