Error Message Said to Use Dual-Layer Disc - How Can I Know the File Size?

Question

This is my first attempt at using iMovie. I used slides, added a music and speaking track over it.
I would like to reduce the size to a standard DVD rather than using expensive dual-layer discs. How do I determine the size?
My Mac is only 80 GB, is that a problem?
Thanks,
Carlos Marques

Answer 1

It seems as if perhaps you've clicked, in iMovie, on 'File' and 'Burn Project to Disc...' instead of Exporting to iDVD.
When you Export to iDVD, your project ought to easily fit on a DVD.
But if you've chosen 'Burn Project to Disc...' that doesn't make a playable DVD ..it creates a backup data disc, and, as Fred suggests, if you're using large or detailed photos, that may need a lot of space ..much more than when using iDVD to make a playable video disc.
(..iDVD compresses everything so that anything up to one or two hours' worth will fit on a 4.7GB DVD, as Fred described. Burning a Project to a disc just copies all the data that's in your iMovie project without compressing anything; without converting hi-resolution photos to the low resolution of a movie. That may be why it's suggesting that you need a Dual-Layer disc if you did choose 'Burn Project to Disc...' by mistake..)