DVD-ROM

Single layer disks can hold a minimumn of 4.3GB while dual layer disks hold a minimum of 7.2GB
 * DVD-ROM (Read Only Memory)**

DVD-RAM (Random Access Memory)

A DVD format wherein DVD-RAM discs can be recorded and erased repeatedly but are only compatible with devices manufactured by the companies that support the DVD-RAM format. DVD-RAM discs are typically housed in cartridges. The data on a DVD RAM can be rewritten numerous times over the period of its life, and for this reason the discs are favoured for data storage. DVD RAMs are frequently used in camcorders and digital cameras to house a high volume of data which can be transferred to another medium before the disc is overwritten. DVD RAMs typically hold up to 9.4GB per double-sided disk.

DVD-RW (ReWritable)