DVD-Random Access Memory
We will basically skip this format, because it is so rare, and is incompatible with virtually all players. So, in short - don't buy it, don't use it . . . don't even think about it !!
This format has one seemingly great advantage - it allows for more than 100,000 rewrites. But do you really think you will need more than the 1000 rewrites that DVD-RW and DVD+RW allow ?
The media is a single-sided disc in a removable cartridge, or a dual-sided disc in a permanent cartridge. It comes in single sided 2.6GB and double sided 5.2GB sizes. Data is written on the disk with a laser using the phase-change method. It is mostly used by Toshiba, Hitachi and Matsushita.