Versatile Multilayer Disc Versatile Multilayer Disc Versatile Multilayer Disc (VMD or HD VMD) is a high-capacity red laser optical disc technology designed by "New Medium Enterprises, Inc.". VMD was intended to compete with the blue laser Blu-ray Disc format and had an initial capacity of up to 30GB per side. At CeBIT in March 2006, NME demonstrated a prototype VMD player and announced that they were expecting to launch the format in the third quarter of 2006. At the Custom Electronic Design & Installation Association trade show in September 2007, NME exhibited two players set for release in October 2007. There were 20
Optical disc authoring require writing the entire disc at once, but allow writing of different parts at different times. This allows a user to construct a disc incrementally, as it could be on a rewritable medium like a floppy disk or rewritable CD. However, if the disc is non-rewritable, a given bit can be written only once. Due to this limitation, a non-rewritable disc whose burn failed for any reason cannot be repaired. (Such a disc is colloquially termed a "coaster", a reference to a beverage coaster.) There are many optical disc authoring technologies for optimizing the authoring process and preventing errors. Some