Describe the Difference Between DVD-R & DVD-RAM
Like most standard DVD formats currently available, DVD-R and DVD-RAM can both store a standard 4.7 gigabytes of data on one side. Despite this similarity, the two formats are different in numerous ways.
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Recording
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The DVD-R format records data only once before the information is permanently stored on the disc. DVD-RAM discs allow users to erase and re-record data 100,000 times or more.
Capacity
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DVD Demystified reports that the earliest DVD-R discs could store 3.95 gigabytes (one gigabyte equals one billion bytes) of data, while the first DVD-RAM discs could hold only 2.58 gigabytes.
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Compatibility
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According to DVD Demystified, the DVD-R format plays properly on most equipment, including players and recorders from manufacturers such as Hitachi, Pioneer and Sharp. However, the DVD-RAM format is only compatible with players from certain manufacturers, including Panasonic, Toshiba, Apple Computer, Hitachi, NEC, Pioneer, Samsung and Sharp.
Housing
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Unlike DVD-R discs, which consist of just the disc, DVD-RAM discs are packaged inside of a cartridge. Moreover, they can only record data when inside the cartridge, according to DVD Demystified.
Writing
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There are two kinds of DVD-R discs. The general DVD-R(G) type is intended for home users while the authoring DVD-R(A) type is intended for professionals. While DVD-R(G) and DVD-RAM are both written with 650-nm lasers, DVD-R(A) is written with a 635-nm laser.
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