DATA RECORDING SYSTEM WITH SERVO PATTERN HAVING PSEUDO-RANDOM BINARY SEQUENCE

摘要

PROBLEM TO BE SOLVED: To provide a disk drive which is insensitive to a positioning defect of a previously recorded servo field and has a magnetic recording disk with a servo pattern and a servo decoding system. SOLUTION: Data tracks have pseudo-random binary sequences for servo information used to control the position of a recording head. A first pseudo-random binary sequence (PRBS) and a second PRBS identical to the first PRBS but shifted by a portion of the period of the first PRBS are located between the track boundaries in alternating tracks in a first region of the servo pattern and between the track centers in alternating tracks in a second region spaced along the track from said first region. A servo decoder 601 has two correlators 605 and 606, which are respectively used for each PRBS. Each correlator outputs a dipulse when its PRBS repeats. COPYRIGHT: (C)2006,JPO&NCIPI