DVD-RAM
[¦dē¦vē¦dē ′ram] (communications)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
DVD-RAM
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DVD-RAM
A rewritable DVD disc endorsed by the DVD Forum. Using phase change technology, DVD-RAMs are like removable hard disks, and the media can be rewritten 100,000 times compared to 1,000 times for DVD-RW and DVD+RW. The first DVD-RAM drives with a capacity of 2.6GB (single sided) or 5.2GB (double sided) became available in the spring of 1998. DVD-RAM Version 2 discs with 4.7GB arrived in late 1999, and double-sided 9.4GB discs in 2000. DVD-RAM drives typically read DVD-Video, DVD-ROM and all types of CD media. See DVD, DVD storage capacities, DVD+RW, DVD-RW and optical disc. |
| Panasonic Drive and Media |
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| In 1998, Panasonic was the first to debut a DVD-RAM drive, which supported both caddy-based and caddyless media. DVD-RAM discs were placed in the caddy for writing, but CDs and all other DVD media were read bare. (Image courtesy of Panasonic Industrial Company.) |
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| Phase Change Recording |
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| In rewritable DVDs, different intensities of the laser turn bits in the phase change recording layer between a crystalline state and an amorphous state. |
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