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Large-capacity, compact memory devices for PCs, of which CD-ROM (compact disc read only memory) is the most common, are becoming indispensable. However, the CD-ROM has a limit to the memory capacity. With the advancement of technologies to increase disc capacity and video data compression, the standardization of DVD (Digital Versatile Disc), specifically designed for PC and video to store motion pictures, was realized.
Hitachi, Ltd. has developed the DVD-ROM drive GD-2000, which is capable of reading CD-ROM and CD-R (CD recordable) discs, and double-speed DVD discs. Hitachi has also developed the first writable DVD-RAM drive GF-1000. The core technology for these products, a compact pickup using the 2-laser-2-lens method and six LSI circuits have been developed. Hitachi has also attempted to visualize the application of DVD in PCs, business and home entertainment.