How is TiVo Series3 HD different from the TiVo Series2 DVR?
The TiVo Series3 HD DVR supports digital and high definition programming from cable and antenna. The TiVo Series2 DVR supports only standard definition from cable, cable with a box, or satellite with a box. Both DVRs can be connected to either a standard TV or an HD TV, but only a TiVo Series3 or TiVo HD DVR can display in high definition on your HD TV. The TiVo Series3 HD has more than three times the recording capacity of the TiVo Series2 DVR.