If you have an Iomega REV drive installed in or connected to your computer and you have a REV disk mounted, the disk may get erased if you attempt to burn an iDVD project.
iDVD features an erase-before-burn function, which allows it to rewrite data on DVD-RW and DVD+RW media. Because the REV drive represents itself as a rewritable DVD device to the operating system, if you don't have a rewritable DVD in your SuperDrive, the REV Disk will be erased and your iDVD project will be written to the REV Disk. Although the REV drive appears as a rewritable DVD, it is not supported for use with iDVD.
To prevent the REV disk from being erased, eject it before you burn an iDVD project.
Important: Information about products not manufactured by Apple is provided for information purposes only and does not constitute Apple's recommendation or endorsement. Please contact the vendor for additional information.