Transducer positioning system for rotating disk drive units

摘要

A transducer positioning system for a rotating magnetic disk memory unit in which servo positioning information is interspersed with data. The disk comprises concentric data tracks individually divided into spaced data sectors. Two sets of radially extending blocks of servo information are recorded between each pair of adjacent data sectors. Adjacent blocks in each set produce asymmetrical pulse trains that are the time-displaced complements of each other. A first set of blocks are positioned radially so that their boundaries lie on the data track centerlines. Each block in the second set is aligned with a data track. A transducer positioning device utilizes the first blocks of information to maintain the transducer in alignment with a track and the first and second blocks of information in moving the transducer from one track to another.