DVD-RAM is rewritable media that uses phase change technology for recording. Two generations of DVD-RAM are available: 2.6/5.2 GB and 4.7/9.4GB. DVD-RAM is designed for data intensive, high performance applications. Data stored on DVD-RAM can be accessed in the same manner as a hard drive, with drag and drop capabilities and can be overwritten 100, 000 times. Double-sided discs are available in Type 1 (non-removable) cartridge. Single-side discs are available bare or with a Type 2 (disc removable) cartridge for reading in later generation DVD readers, DVD-Video players and DVD recorders.