POSSIBLE CRITERIA FOR EVALUATING INFORMATION RELIABILITY OF MAGNETIC STORAGE DEVICES,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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The typical magnetic direct-access memory MDAM may be divided into two parts the magnetic memory itself based on cores with a rectangular hysteresis loop RHL and the electronic control device for data loading and extraction. Since the design reliability of the magnetic memory MM is extremely high, in this case a more important consideration is the effect of internal and external noise, which may distort the stored information. The performance of MDAM in the presence of noise may be assessed by means of the criterion of its information reliability, construed as the ability of the device to store and issue reliable information in the presence of noise, or as the ratio of useful signal to noise. Various types of MM may be compared from the standpoint of the coefficient of selective capability, i. e., the ratio of the minimal current switching a selected core to the maximal noise current in the memory. The design and calculation of MM should assure large tolerances for deviations of all the parameters from their rated values. Thus the reliability of memory elements can be maximized and their cost reduced in view of the attendant relaxation of certain requirements. Working currents of the MM represent the critical parameter whose deviations principally determine the reliability of the MM.
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