How to calculate HD space needed

I need to videotape a ceremony on Friday and show it very quickly afterwards. I have a new Canon XL2 cam, and I played around with capturing direct into iMovie 5 using the FW cable. My plan was to capture it this way live; at the end of the 90 min save the project, and then show via SVideo connection to a TV. Not sure how to calculate the amount of HD space I will need for 90 minutes of video. I guessI could also capture just to tape, rewind and show via SVideo, but ideally need less turn around time than that.
Thx,

DV (Digital Video) uses up about 13 gigabytes per hour.
So 90 mins worth would need about 20GB.
But how long does it take to rewind a tape? Three or four minutes?
It'd be far better to rewind the tape, and connect the camcorder to a TV, than to lug around a Mac while you're shooting! How're you going to hold onto the Mac if you need to move around?
If you're going to be static all the time, and won't need to move, it might be OK ..but you'd need to do one or two 'dry runs' of 90 mins each FIRST to be ABSOLUTELY sure that everything goes to plan, and that the hard disc doesn't stutter, or "housekeeping" jobs within the Mac don't interfere, etc.
Of course, what might suit you better is a dedicated video-capture FireWire drive strapped to the camera, like a "FireStore". That's dedicated to video capture, and does nothing else. It also saves time later, because there's no need to capture from your tape: just edit the footage already on the FireStore disc.
But would what you get from taping the ceremony (..if you're getting paid..) pay for a FireStore? Hmm.
I'd stick with tried and trusted tape..

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this link can assist you:>
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Mark as answer or vote as helpful if you find it useful | Ammar Zaied [MCP]

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Hi,
Please let me know about those factors are involved on the above topic. Share something from the real experience or with examples in details.
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Hi,
NOte: some links although for 2010 but fits for 2013
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Please remember to mark this as answered if it helped you

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This might be a dumb question, but how do you calculate the HD space on a Nano or Classic?
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In order to calculate the space utilized by a table you can do the following :
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How to calculate HD space needed

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