I was able to make a 4-minute movie on iMovie ('06) and burned it to a disc, but the following error message appears (the file is not too large for the disc, which is a DVD+R, 4.7GB). Any help is appreciated. "The project could not be opened, because the disk is full, the folder is locked, or the folder permission are incorrect. , "If the project is on a CD-ROM, network server, or locked disk, then copy it to your hard drive before opening it. If the project is already on your hard disk, then the disk may be completely full, or you may not have permission to modify that folder. Correct the problem and try again."