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DVD types

DVD types

A DVD-RAM is easily recognized due to the numerous rectangles on its surface.DVD-ROM discs are pressed similarly to CDs. The reflective surface is silver or gold coloured. They can be single-sided single-layered, single-sided double-layered, double-sided single-layered and double-sided double-layered. As of 2004, new double sided discs have become quite rare.

DVD-R discs can record up to 4.7 GB in a similar fashion to a CD-R disc. It is supported by the DVD Forum. Once recorded and finalized it can be played by most DVD-ROM players.

DVD-RW discs can record up to 4.7 GB in a similar fashion to a CD-RW drive. Supported by the DVD Forum.

DVD-RAM (current specification is version 2.1) require a special unit to play 4.7 or 9.4GB recorded discs (DVD-RAM disc are typically housed in a cartridge). 2.6GB discs can be removed from their caddy and used in DVD-ROM drives. Top capacity is 9.4GB (4.7GB/side). Supported by the DVD Forum.

DVD+R discs can record up to 4.7 GB single-layered, single-sided DVD+R disc. This is currently up to 16x speed. Like DVD-R you can record only once. Supported by the DVD+RW Alliance.

DVD+RW discs can record up to 4.7 GB with up to 4x speed. Since it is rewritable it can be overwritten several times. It does not need special "pre-pits" or finalization to be played in a DVD-Player. Supported by the DVD+RW Alliance.

DVD+R DL is a derivate of DVD+R that uses dual layer recordable discs to store up to 8.5 GB of data. Supported by the DVD+RW Alliance. All above formats are also available as 8 cm (3 inch) sized DVD mini discs (not mini-DVD, which describes DVD data on a CD) with a disc capacity of 1.5 GB.

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