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Proceedings Paper

Development Of Large Capacity Optical Disk
Author(s): Yasunori Kanazawa; Masaru Ito; Shin-ichi Abe
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Paper Abstract

A high performance DRAW type disk is developed, and the disk is used in Hitachi's newly developed file memory system, HITFILE 60. The total capacity of the system is 83 gigabytes, and the mean access time is about 6 seconds, on single disk, the mean access time is 250 msec. The resolution of the picture is about 16x15.4 lines/mm. The disk, which diameter is 300 mm 0, has the storage capacity is 1.3 gigabytes for single sided type (0C-301-1) or 2.6 gigabytes for double sided type (0C-301-2).The track pitch is 1.61μm and 48,000 tracks are engraved spirally. A track is devided into 64 sectors and 512 bites of user's data can be recorded in each sector. Low error rate of 10-12, has been confirmed after error correction, with above mentioned file memory system. Long life, more than 10 years in normal room condition, has confirmed by accellerated life test under the condition of 60°C 95 %RH. The disk is consisted of three layers on chemically tempered glass plate with 1.1 mm thickness. The first layer is UV-curable polymer layer, the 2nd is intermediate layer of cellulose nitrate, this ensures precise pits formation on grooves, the 3rd isTe-Se-Pb alloy recording layer. The disk has the air sandwitch structure, in which two disks above mentioned are pasted together with 0.6 mm air gap. The disk is completly protected from dust, finger prints and scratches by newly developed plastic cartridge.

Paper Details

Date Published: 25 September 1984
PDF: 8 pages
Proc. SPIE 0490, Applications of Optical Digital Data Disk Storage Systems, (25 September 1984); doi: 10.1117/12.943426
Show Author Affiliations
Yasunori Kanazawa, Hitachi Maxell Ltd. (Japan)
Masaru Ito, Hitachi Ltd (Japan)
Shin-ichi Abe, Hitachi Ltd. (Japan)

Published in SPIE Proceedings Vol. 0490:
Applications of Optical Digital Data Disk Storage Systems
Marino G. Carasso; W. Michael Deese, Editor(s)

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