To remove encoded files from your hard disk:
Choose Advanced > Delete Encoded Assets.
When you burn a DVD, iDVD needs temporary space on your hard disk to store the encoded files for your project. To burn your iDVD project to a single-layer DVD disc, you should have 8 to 10 gigabytes (GB) of free disk space on your hard disk, depending on the size of your project. For double-layer discs, you need 15 to 20 GB of free disk space. To check how much disk space you have, Control-click the hard disk icon on your desktop and choose Get Info. Then look next to Available to see how much space you have.
The encoded DVD files remain on your hard disk inside your project’s folder. If you do not want to save the encoded files after you burn your project to a disc, you can delete them.
Choose Advanced > Delete Encoded Assets.
If you want to save the encoded files so you can burn another disc without going through the encoding process, you can save your project as a disc image. For more information, see Related Topics below.