Your hard disk sets aside a temporary copy of the data in the DVD desktop image before you burn the DVD. You must have enough available space on your hard disk and on the DVD-R disc for the data you want to burn. To determine space available, select your hard disk or DVD-R disc image, then choose Show Info or Get Info from the File menu.
Note: Your computer may have either Show Info or Get Info, depending on which version of Mac OS X you are using.
Use DVD-R General media with a 4.7 GB media capacity.
When handling discs, be careful not to leave fingerprints, place other materials on the discs, or add labels to the discs that may cause them to become unbalanced when spinning.