New to the TiVo family but already feel like I need more memory. Have been doing more recording than I thought I would. I am looking to upgrade to 2TB (unless 3TB is around the same price) Overall, which hard drive is the most recommended? I've seen a few posts recommending Western Digital, Seagate, and even Samsung drives. Also, will I need to format the drive before installing? And for the particular model that I have, what tools will I need to remove the case? Thank you for any help you can provide.