What is DVD-RAM?

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DVD-RAM is a high-capacity, high-performance optical disk that allows data to be read, written and erased. It is designed to work exactly like a floppy disk, allowing users to copy and delete files from it, and use it to run programs. DVD-RAM offers all of the benefits of DVD ­ including high capacity and compatibility with CD formats ­ combined with enhanced rewriteability.

With current capacities of 2.6GB to 5.2 GB per disk, DVD-RAM offers up to eight times the storage of a rewriteable CD. The growth path for DVD-RAM takes capacities even higher to 9.4GB per disk. In addition, DVD-RAM is much cheaper than conventional magneto-optical drives. At less than one penny per megabyte, it is the most economical rewriteable medium available today. Also, it can read all of the CD and DVD formats including CD-ROM, CD-Audio, CD-R , CD-RW, DVD-ROM and DVD-R, making it an ideal choice for high-density data storage and exchange.

Technology Overview
DVD-RAM drives use phase-change technology in which a laser heats the inner surface of the disk to magnetically charge it. This allows the data to be rewritten hundreds of thousands of times. A "wobble-land-groove" format provides clocking data, with marks written on both the grooves and the lands between grooves. The grooves and pre-embossed sector headers are molded into the disc during manufacturing. The DVD-RAM wobble-land-groove format or track structure makes DVD-RAM technology reliable, and the constant linear velocity format provides high access speed and capacity.

 

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