Advertisements In MegaZone's FAQ: "How many hours of HD content can the S3 store? The S3 can store up to 35 hours of HD content. Since all digital content is recorded as-received, capacity will depend on the compression of the source material." I will note that the sticker on the side of the TiVo HD box that I just received states "25 Hours of HD". I would assume this to be the minimum. If every HD channel recorded used the entire bandwith of the transport stream (~8.2GB/hr), one should be able to store about 30 hours of HD programming on a 250GB disk. Subtract some disk space for the HD and SD Live buffers plus system overhead, and 25 hours sounds about right.