If encoded with many of the options out there, I would assume it could be 17MB+ depending on the codec used. I don't know about uncompresses. I am dealing with a lot of 40-55 minute HD (720p) movie files which have been recorded and they range from 900-1400MB. Don't know if this helps, but hopefully you get an idea.
I am looking at buying a few more 1TB hdds to add to my RAID setup for video file storage, and they have been coming down in price here and there. FYI.
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