Question: 1 movie how much mb?
Answer: Answer: A: No absolute answers, as it depends on teh movie and how well it compresses. However for a 90 min movie you'd be looking at 1-1.5GB for SD, and 3-4GB for 720p HD, more for 1080p HD. The size of the rentals is the same as the rental/purchase in iTunes so you'll get a feel for it there.