Sector identification method for hard sectored hard files

Abstract From the Canadian patent

A disk file control provides for tracks having defective sectors by forming sectors as a single uninterrupted stream of, serial data containing both identifier (ID) and data portions. Reading a single ID portion characterizes the entire track to permit writing data without a separate revolution to read the ID field. The ID information includes the offset of the first logical sector on the track and the locations of defective sectors that must be skipped. As soon as one ID is read the location of the, addressed sector is ascertained and the ID data for the sector to be written is formulated so that the entire sector including both ID and data can be written when the sector first approaches …