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472 Posts
The 501/508 stores a 9 day program guide on the hard drive, when you are searching the guide, you are retrieving the stored listing from the drive. The 301 doesn't have a hard drive and has to store the guide in internal memory. The guide is constantly looped and sent over the satellite, when you request new listings, the receiver has to wait until the pertinent section of the guide is sent and then retrieve it.
