Definition

• The RAM in DVD-RAM stands for "random access memory," which is the same way traditional hard drives store memory. This means that the data stored on a DVD-RAM can be placed anywhere on the disc, and not necessarily in order. This is in contrast to RW discs, which must store their data in one long spiral track, limiting the speed at which data can be recovered.
  
  

Function

• A DVD-RAM is basically a virtual hard disk, and can function just like any other storage drive on a computer. Files can be removed and added to the discs on the fly. Documents, video and audio can be edited and saved to a DVD-RAM just like they are on a physical hard drive.
  
  

Advantages

• DVD-RAM discs are by far the longest-lasting and most durable of the rewritable DVD formats. A DVD+/-RW can be rewritten approximately 1,000 times before it becomes unusable. But a DVD-RAM can be written over 10,000 times. It is projected that data on a DVD-RAM could be accessed for up to 30 years before it begins to degrade.
  
  

Benefits

• DVD-RAMs often come in protective cartridges, which is one of the reasons why they are not compatible with most DVD players and drives. In a compatible drive, a DVD-RAM can be accessed while still in the cartridge, limiting damage from dust and other environmental hazards. This further increases the lifespan of the discs.
  
  

Uses

• Few DVD drives, and even fewer DVD players, are compatible with DVD-RAM. It is mostly used by professionals who want to keep large, editable files on portable formats, and by archivists who appreciate the long lifespan of the format. The discs are somewhat popular in camcorders, however. Most DVD camcorders use DVD-RAM because of its durability and rewriting capabilities.