DATA STORAGE DISK WITH INFORMATION ENCODED IN THE POSITION ERROR SIGNAL FIELDS

THERE IS DISCLOSED A DISK FOR USE IN A DISK DRIVE AND A METHOD FOR MAKING THE DISK. THE POSITION ERROR SIGNAL (PES) FIELDS FOR EACH TRACK ON THE DISK ARE WRITTEN WITH PREDETERMINED DATA, E.G.SERVO DATA, ENCODED THEREON. IN THE PREFERRED EMBODIMENT: A) THE DATA SUCH AS THE TRACK NUMBER IS MAPPED INTO CODEWORDS OF AN ERROR CORRECTION CODE (ECC); B) BIT-VECTORS ARE USED TO ENCODE THE SYMBOLS FOR FURTHER REDUNDANCY; AND C) THE RAW DATA WRITTEN IN THE PES FIELDS IS CONSTRANED TO EQUALIZE THE ANALOG SIGNAL CHARCTERITIC USED BY THE SERVO SYSTEM FOR POSITIONING. THUS, THE INVENTION ALLOWS THE PES FIELDS TO BE USED AS IN THE PRIOR ART WHILE ALSO BEING USED AS A SOURCE OF DIGITAL DATA WHICH IS ROBUTLY RECORDED THEREIN. IN ONE ASPECT OF THE INVENTION, THE TRACK ID''S ARE WRITTEN IN THE PES FIELDS IN A SELECTED PATTERN IN WHICH THE TRACK ID FOR EACH TRACK IS RECORDED IN TWO PES FIELD GROUPS. ONE OF THE TWO PES FIELD GROUPS IS CENTERED ON THE SELECTED TRACK WHILE THE OTHER PES FIELD GROUP IS OFFSET SO THAT IT PARTIALLY OVERLAPS THE ADJACENT TRACK, AS WELL AS THE SELECTED TRACK. THE PES FIELDS WILL TYPICALLY BE RECORDED ON THE DISK AT THE TIME OF MANUFACTURE AND NOT CHANGED THEREAFTER.FIGURE 4