you created. Just follow the steps outlined in "Step Four -- Burn the DVD" but use the newly created image instead of the "installESD.dmg" one: And look! It's burning on a single-layer DVD : And it burned the single-layer DVD successfully! I took this newly created single-layer DVD and booted my MacBook Pro off of it (holding "Option" while rebooting), so it looks like this process works. It DOES take a very long time to boot from the DVD though. Thanks again Benoit! USB Thumb Drive Installer If you have an 8 GB USB thumb drive, you can create an installer out of that as well. I have not tested this process but here are the steps. First you need to format the USB drive (and note that formatting will completely erase all of the contents of your USB Thumb Drive). Just go over to Disk Utility and choose the "Partition" tab. Click the "Options" button and select "GUID Partition Table" which will "bless" the new partition and make it bootable. Hit "Apply" which will then format (and erase) the USB Thumb Drive. Lastly, click the "Restore" tab and select the "InstallESD.dmg" file as your "source" and the USB Thumb Drive as the "destination". Click "Apply" to put the expanded installer on the Thumb Drive. So, in the end, you will have either a bootable DVD or USB Thumb Drive complete with that growling Mountain Lion Installer. To use either of these, insert the DVD or USB drive and restart