155:, etc. existed as re-writable media close to the feeling of handling floppy disks, but the advantage that the PD drive can be read by the CD-ROM was merit compared with those. At that time the CD-ROM drive was becoming an essential peripheral device, but it was not necessarily built in every PC yet, desktop machines that were mainstream at that time had many models with only one drive bay. In such an environment, a PD capable of serving as both a CD-ROM drive and a large capacity (then) auxiliary storage device was advantageous both in terms of cost and installation.
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It has a capacity of 650 MB on one side, and the size of the disc is 12 cm in diameter (5 inches) similar to a general CD or DVD, and it is used in a state where it is housed in a square cartridge. The phase change recording technology using red laser light is adopted, and about 500,000 times of
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adopts a cartridge similar to PD, and the 2.6 GB version 1.0 standard, which has just one side capacity equal to 4 times the PD, DVD - It was possible to read and write PD in the RAM drive. However, in the summer of 2000, compatibility with PD was not taken into consideration when creating DVD-RAM
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CD-RW can be cited as a re-writable medium at the same time, but it is characterized by being able to write and delete on a file basis, which is close to the feeling of handling
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version 2.0, which has the same with 4.7 GB standard capacity as other DVDs. At this point PD drives and media effectively disappeared from the market.
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121:. Both drive and media, most of which are manufactured by Matsushita Electric Appliances only, the company also released a
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The built-in PD drive and the external type are sold, respectively, and both of them can read the
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PC with a 650 MB auxiliary storage device and a 4× CD-ROM drive, a PRONOTE PD (August 1996).
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DVD-RAM appeared as a successor technology in April 1997,
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108:Matsushita Electric Industrial Co., Ltd.
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102:(or Phase-change Disc) is a rewritable
241:Computer-related introductions in 1995
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106:and a standard for it, developed by
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95:PD-518E with medium TEAC PD-M650
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16:Rewritable optical disc standard
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194:. You can help Knowledge by
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114:rewriting is possible.
256:Computer storage stubs
190:-related article is a
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251:Japanese inventions
138:packet write system
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100:Phase-change Dual
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20:Phase-change Dual
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188:computer-storage
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110:in April 1995.
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246:120 mm discs
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104:optical disc
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59:Data storage
38:Optical disk
143:Meanwhile,
134:floppy disk
235:Categories
34:Media type
149:ZIP drive
123:notebook
64:Extended
45:Encoding
160:DVD-RAM
153:SyQuest
83:PD-M650
72:DVD-RAM
136:using
119:CD-ROM
91:Drive
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186:This
130:CD-RW
56:Usage
192:stub
132:and
93:TEAC
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145:MO
68:to
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