What is the SD and HD recording capacity?
There are two types of TV channels the TiVo HD handles: analog and digital. The goal of the TiVo HD is to record digital information onto the hard drive. While analog channels must be converted into a digital format, digital TV signals are provided in a already compressed MPEG2 digital format. Since the TiVo HD must convert the analog channels into a digital format, it provides 4 different levels of compression for standard definition (SD) analog recordings.