With functionality similar to an external hard drive, DVD-RAM is designed for data intensive, high-performance applications. Single-sided disc offers up to 4.7GB of re-writable storage with up to 3X write speed. Drag and drop just like a hard drive. You can add to or write over data stored on a DVD-RAM more than 100,000 times. DVD-RAM cartridges and discs require recorders and DVD-ROM drives compatible with DVD-RAM media, and will not play in a standard DVD player.