A STUDY OF MASS MEMORY APPLICATIONS

摘要

In 1975, several solid-state technologies will be available for mass memories (about 10^ bit capacity). They include various optical and electron beam systems, moving magnetic domain systems, and the sonic block organized random access memory (BORAM) system. The major development thrust in the United States today is toward systems suitable for ground-based commercial data processing. There are optical systems under development at the moment which use write-once storage media, such as photographic film, thermoplastic or phctoplastic materials, and ablative materials. Because of the difficulties involved with non-nechanical, optical beam deflection schemes, the present optical memory systems use electro-mechanical devices to deflect the light beam or, alternatively, they move the storage medium. This can be done by making the medium in the form of a tape, a disc, a drum, or as a set of storage cards. Systems cf this general type will be available within one or two years;some preliminary sales have already beep made.