Abstract
AbstractOne of the recent trends in the development of magnetic disk devices is the advent of small disks. The small disk has a great influence on the performance of the magnetic disk subsystem.This paper assumes that the small‐sized magnetic disk subsystem will be introduced around 1995 and formulates the relation between the disk size and the performance/cost. The disk array subsystem architecture using small disks is considered, and the evaluation is made based on the number of disks for the parallel synchronous transfer.As to the file performance, code and image information are considered and the condition for the subsystem with the best cost/performance ratio for each kind of information is shown. It is shown that small disks of 1 to 2.5 inches are being developed rapidly at present aiming at the application to the portable equipment and will experience the widest area of application. The requirement for the magnetic disk device, e.g., the relation between the rotation for each size and the number of parallel synchronous transfer in the best configuration, is discussed.
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