I've had a TiVo since Series 2, but never upgraded a HD. I've got a Roamio Pro. And a Mac, not a PC. In addition I'd have to transfer the recordings from my TiVo to an external hard drive on my Mac, since there's not enough space on my Mac internal HD. And, worst of all, I have TWC, so copy protection. A 4 TB HD is the maximum out of the box upgrade? What's currently the best HD for this purpose? Can someone please give me step by step instructions (or a link if I missed it from elsewhere) how to install a new HD? And how to transfer recordings from the HD on my Roamio, given my Mac and TWC constraints? Many thanks!