Process for magnetic recording and reproducing data, magnetic markers, their manufacturing process and magnetic recording equipment

摘要

The present invention uses a magnetic recording medium equipped with magnetically readable recording servo pits (20) which are preformed on a magnetic recording medium and have magnetic characteristics different from those of a recording magnetic film (5), detects magnetically a tracking signal or preformat signals such as sync signals, address signals, and the like, from the magnetic flux distribution (leakage magnetic field 9) occurring at edges of each of the servo pits (20) using a magnetic head (10), makes servo control of the position of the magnetic head (10) by the detected tracking signal and records or reads magnetically the data along the center of a track. In the magnetic recording medium of the present invention, magnetically readable, wobbled servo pits or sync pits, track address pits and data pits are preformed on the magnetic recording medium, these pit portions have magnetic characteristics locally different from those of the recording magnetic film and have a magnetic film structure wherein saturated magnetization is smaller than at other portions or the magnetic film is removed locally. These preformed pits can be read magnetically by detecting the local magnetic field (leakage magnetic field) generated at their edges by the magnetic head.