SYSTEM FOR OVERCOMING FAULTS IN MAGNETIC ANISOTROPIC MATERIAL

摘要

Mass memories using magnetic domain storage devices suffer from the large number of flaws found in the storage medium. This invention comprises a system for identifying and isolating those channels in a mass memory medium which contain flaws and for controlling the storage of information in the medium to avoid those channels. The system comprises the storage material having, in addition to the normal information storage registers, additional registers which contain the identification of those storage channels which contain flaws. This identification is in the form of bits of data whose movements are synchronized with the movements of the information stored in the memory, and which identification blocks the transfer of information into defective channels. During the initial testing of the mass memory, information is stored in each of the information storage channels, and that information is subsequently read out. The information which is read out is used as a word in a separate channel identification register to identify those channels which do not contain flaws. The information stored in the channel identification register is read during normal circulation of information through the transfer loop, and the presence of channel identification in that register opens loading gates to permit the loading of information into good channels and to prevent the loading of information into defective channels.