DVD-R discs offer a write-once format that holds up to 4.7Gb of high-density data. You can store thousands of digital photographs or you can store up to two hours of digital videos in SP mode or four hours in ep mode, on a single disc. DVD media is capable of producing pre-mastering discs and is ideal for high volume data recording, archiving and playback. By using DVD discs, information is permanently recorded and cannot be altered or erased.