What is a DVR ?
DVR stands for "digital video recorder:" electronic devices used to record and store programs from your television. They serve the same basic function as VCRs, though they have additional features which make them considerably more efficient.
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Basics
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Unlike VCRs, which store shows on VHS tapes, DVRs record shows digitally: storing them on a hard drive much like a computer and then playing them back on command.
Types
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Some DVRs are stand-alone units, while others have been integrated into cable or satellite boxes. Portable DVRs include small screens to allow the programs they record to be replayed anywhere.
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More Storage Space
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Because there are no tapes involved, DVRs are able to store hundreds of hours worth of programming. Older VCRs were limited to six to eight hours as dictated by the recording tapes.
Increased Recording Options
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Many DVRs offer "season passes," which automatically detect and record every episode of a given show. Some DVRs also have "favorite" settings, which allows it to find and save shows which you haven't specifically asked for, but which might match your viewing preferences.
HD
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Though not all DVRs have HD capacity, the fact that they store their programs digitally allows them to preserve high definition recordings much more readily. VCRs simply lack the capacity to retain the clarity of HD.
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