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Proceedings Paper

Towards New Information Systems : Gigadisc
Author(s): Philippe Popoff; Jean Ledieu
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Paper Abstract

Growth in knowledge has generated information in an ever-increasing volume and, simul-taneously, has given rise to the need for its efficient distribution and long term pre-servation. The new generation of storage media must be removable, possess a high recording capacity and achieve substantially improved storage life over what magnetic media can achieve for archival purposes. Gigadisc meets all these requirements : The Gigadisc digital optical disk of Thomson-CSF is a computer peripheral which uses solid-state technology to store data. GIGADISC allows for the "irreversible" storage of large volumes of digital data. Its 12" disk offers a capacity of one thousand megabytes (one gigabyte) on each of the recording surfaces. Once written, the data can no longer be altered. The disk is exchangeable and is protected within a cartridge which facilitates manipulations of the disk. The disk together with the GIGADISC drive has been designed to provide for an archivable life of over 10 years. The read-write unit includes a laser and an optical head. It can access each block in the disk either at random or in sequence. The SCSI interface allows for connecting GIGADISC to most computers. Its Controller can handle up to 8 GIGADISC read/write units. Maintenance tests can be performed via a terminal connected to the controller. A high-level of performance is achieved by GIGADISC : the access time is of 10 ms within a band of 40 tracks, 200 ms average beyond the current band, excluding 27 ms of average latency. The GIGADISC read/write unit is supplied either in a rack-mounted chassis or as a small stand-alone unit for installation apart on the top of a desk. This wide range of facilities makes GIGADISC very attractive for running a great variety of applications in the office automation, data processing and image storage/retrieval environment.

Paper Details

Date Published: 25 September 1984
PDF: 7 pages
Proc. SPIE 0490, Applications of Optical Digital Data Disk Storage Systems, (25 September 1984); doi: 10.1117/12.943427
Show Author Affiliations
Philippe Popoff, Alcatel-Thomson Gigadisc (France)
Jean Ledieu, Alcatel-Thomson Gigadisc (France)

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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