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Crunching the Numbers. According to Apple, a standard-definition movie averages about 1.5GB in size, so only two such files would fit within the 3.73GB space of a 4GB flash drive, leaving a little over 700MB for other files.
At 1.5GB for a two-hour standard-definition movie (the approximate size given by the iTunes store), the hard drive could (in theory) store 10,240 two-hour movies. That's 853 days, or two years and four months. For HD video, around 4.5GB for two hours, 15.36TB equates to 3,413 movies, or 284 days of footage.