from the Internet. Functions TiVo DVRs communicate with TiVo's servers on a regular basis to receive program information updates, including description, regular and guest actors, directors, genres, whether programs are new or repeats, and whether broadcast is in High Definition (HD). Information is updated daily into its program guide from Rovi (Tribune Media Services was used prior to September 2016). Users can select individual programs to record or a "OnePass" (formerly "Season Pass") to record all episodes of a show. There are options to record First Run Only, First Run and Repeats, or All Episodes. An episode is considered "First Run" if aired within two weeks of that episode's initial air date. OnePasses can also "bookmark" shows from internet streaming video services and show a combined view of recordings and bookmarks. When users' requests for multiple programs are conflicting, the lower priority program in the OnePass Manager is either not recorded or clipped where times overlap. The lower priority program will be recorded if it is aired later. TiVo DVRs with multiple tuners simultaneously record the top priority programs. TiVo pioneered recording programs based on household viewing habits; this is called TiVo Suggestions. Users can rate programs from three "thumbs up" to three "thumbs down". TiVo user ratings are combined to create a recommendation, based on what TiVo users with similar viewing habits watch. For example, if one user likes American Idol, America's Got Talent and Dancing with the Stars, then another TiVo user who watched just American Idol might get a recommendation for the other two shows. The amount of storage capacity for programs is dependent upon the size of the hard drive inside the TiVo; different models have different sized hard drives. When the space is full on the hard drive, the oldest programs are deleted to make space for the newer ones; programs that users flag to not be deleted are kept and TiVo Suggestions are always lowest priority. The recording capacity of a TiVo HD DVR can be expanded with an external hard drive, which can add additional hours of HD recording space and standard definition video recording capacity. When not recording specific user requests, the current channel is recorded for up to 30 minutes. Dual-tuner models record two channels. This allows users to rewind or pause anything that has been shown in the last thirty minutes — useful when viewing is interrupted. Shows already in