Sony and Hitachi Develop Optical Disk File Systems

Article Abstract:

With help from the Kokusai Deshin Denwa Co. (KDD), Sony has developed an optical disk file system that is re-programmable. Shipments of the disk to the KDD telecommunications company will begin in late October 1985. Hitachi has developed a similar optical disk, with slightly higher storage capacity and reduced noise. Both use a recording layer made of terbium, iron and cobalt. The Sony disks are thirty cm with 43,750 tracks, while the Hitachi disks are twelve cm with 17,000 tracks per side. The Sony drive with two controllers has a 2G bit capacity. The Hitachi disk, for which there is no commercial prototype, stores 550Mbytes. A picture of each drive is shown.

Product introduction, Sony Corp., Product development, Optical Memory, New Product

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Hitachi 8.8-Inch Disk Drives Designed for More Capacity

Article Abstract:

H-6555-1 is an 8-inch disk drive from Hitachi Ltd. It provides a larger storage capacity, with a maximum of 2GB. System expansion can add an additional 500 MB drive. This disk drive offers high performance and reliability, compactness and easy-to-use interfaces. Charts are used to illustrate the H-6555-1 drive.

Evaluation, Product/Service Evaluation, Reliability (Trustworthiness), Memory management, Reliability, Storage Capacity, Expansion, 8" Disk, Hitachi H-6555-1

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Hitachi Expands Production Emphasizing Compact Drives

Article Abstract:

Hitachi Ltd. is expanding production of compact floppy disk drives based upon the three-inch standard. A single drive unit, HFD- 305D is a dual sided disk drive version. The compact disks are interchangeable with the five-inch disk.

Product information, Standard, Standardization, Manufacturers, 3.5" Disk, Production

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