How many HD video minutes do I get per 1GB of free storage? I have 7GB free. If I give that to someone to record, what sort of ballpark figure would I get for a HD video recording? There may be about 10 individual videos being recorded over a couple of hours, if that makes a difference. Maybe just one hour long one.

I just want to know a rough figure but ideally with some maths so I can work it out myself.
The iPhone 4S takes video at 1080p and 30 fps and initial tests are showing that video takes 200MB per minute. At roughly 12 GB per hour, what seemed staggering a year ago is now quite quaint with the iPhone 4 recording at less than 5 GB / hour.

MacWorld reports that an hour of iPhone 4 video is 4.8 gig.


  The iPhone records its 720p HD video at around 10 megabits (Mbps) per second. That translates to about 80MB per minute, as we noted above, or a staggering 4.8GB per hour. (Hope you sprung for the 32GB model!)