how many movies can I fit on a 500GB external hard drive?

Q: I want to back up my dvd (movie) collection to a external hard drive. I've seen one that is 500GB and was wondering how many movies I can approximately fit on this. The dvd movies I want to back up are all store bought dvds and I know some are longer than others, but I'm looking for an approximate number. Thanks for any answers.

A: well a dvd disk takes about 4.7gb of data on it so i guess 500 gb will take about 110 dvd's ripped at the regular 420p definition.

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