Actually, there are a few formats (SP, LP, SLP/EP) available. SP gives you two hours of play time, LP is four hours and SLP/EP is six hours. The more a tape can hold, the faster the play/record speed, which in turn means a higher quality picture. SLP/EP is higher quality but does not last as long because of the faster play speed, as that wears the tape out faster. I am guessing they chose SP so the cassettes would last a longer time.
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