DVD-RAM is a rewritable media that uses phase change technology for recording. Two generations of DVD-RAM are available: 2.6GB/5.2GB & 4.7GB/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 & drop capabilities, & can be overwritten 100, 000 times. Double sided discs are available either in a Type 1 (non removable) cartridge (5.2GB capacity) or Type 4 (removable) cartridge (9.4GB capacity). Single sided discs are available bare, or with a Type 2 (disc removable) cartridge for reading in later generation DVD readers, DVD-Video players & DVD recorders.