I have looked high and low for a chart that lists how many minutes in different resolutions will fit on a 256 Gb drive or 64 Gb CF card. Can anyone point me in the right direction? Renting a unit so want to be prepared. Thank you, George

This site will give you an approximate idea:
Video Space Calculator - Digital Rebellion (http://www.digitalrebellion.com/webapps/video_calc.html)

I work mainly in TV at 1080/25p with ProRes422 or DNxHD-145, so in my mind, it's about 1 GB per minute !