I have a Series 2 1400060 and a Series 2 2400080. Neither are working due to, I believe, bad hard drives. I see various Tivos for sale on Craigslist, for instance, a Series 2 TCD649080 for $30. Can I take the drive out of the TCD649080 and put it into one of my Tivos? Is there a way to know what will be compatible with my Tivos?