Just got my TiVo Roamio Plus and was going to set it up this weekend, although there is no rush. Still waiting for the Mini which should arrive early next week. Anyway, I think I'll want to upgrade to 3TB right away. What are the downsides to getting started with existing drive and using the TiVo for a few days, weeks or even months? I know recordings would be lost. May not be a big deal. Maybe they can be transferred to computer and back if needed? Would I need to re-run guided setup with new drive? Cable cards need to be re-paired? Anything else? Thanks!