How is a TiVo HD DVR different from Series2?
The TiVo 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 the TiVo HD DVR can display in high definition on your HD TV. The TiVo HD has more than twice the recording capacity of the TiVo Series2 DVR.