Drive Support As of late 2012, the Apple iMac product line consists of 21.5-inch and 27-inch models that don't include internal optical drives. To burn DVDs on these iMacs, you'll need a compatible external drive that's attached directly to the computer, not a networked device.
The Apple USB SuperDrive provides this functionality, including support for DVD-R, DVD-R DL, DVD+R, DVD+R DL, and DVD-RW discs, along with CD media. DL discs use two layers to hold up to 8.5 GB of data and require drives new enough to support the format. Erasable, reusable DVD-RW media may not be compatible with all optical drives and with optical readers in devices other than computers. For optimal media compatibility, use DVD-R media, the most common form of the 4.7 GB version of these discs. If you select an external mechanism from another manufacturer, verify that it can write to the type of DVD media you want to burn. In the Finder When you insert a blank recordable DVD in your iMac's internal or external optical drive, the disc mounts to your desktop just like any form of writable media. You can change the default anonymous name of the disc by selecting it on the desktop, pressing 'Return' and typing in the text you want.
You also can press 'Command-i' to open a Get Info window in which you can edit the disc's title. To add files to it, drag and drop them on the disc icon or copy them from locations on your hard drive, double-click on the disc icon to open it and paste in the files. The Mac OS X Finder doesn't move your original items. Instead, it adds aliases, pointers to the real files and folders, saving disc space and avoiding the redundancy of duplicate files. Once you add all the items you want the disc to contain, open the 'File' menu and choose the 'Burn' command, which will show your DVD's name after the command name.
Burn Folder A burn folder gives you a place to put files before you're ready to burn them to a DVD. When you drag or paste files and folders into a burn folder, the Finder adds aliases, just as it does when you add items to a blank DVD.
To create a burn folder, open the 'File' menu and choose 'Burn Folder' from the 'New' submenu. The name you give the folder becomes the title of the DVD you burn from it. If you insert a blank DVD and add files and folders to it but eject the disc without burning it, Mac OS X creates a burn folder on the desktop that contains the items you planned to include. When you're ready to burn a DVD from a burn folder, double-click on it to open it and choose the 'Burn' command from the 'File' menu.
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You can burn multiple DVD copies from the same burn folder. Disc Images and Copying If you've burned a DVD and need another copy of it but don't have a burn folder that represents its contents, you can use the Disk Utility application that's included in the Mac OS X Utilities folder. After you launch Disk Utility, insert the DVD in your optical drive and make a disk image from it. Once you save it, this image exists as a file on your hard drive, one you can use to burn a duplicate of the original DVD. To do so, choose the image file from the list of disks in Disk Utility, insert a blank DVD and burn the file to it.