Magnetic head with high reliability of the data protection, magnetic disk apparatus including the magnetic head and the method of recording information on the magnetic disk apparatus without miserasing the previously recorded data

Abstract

There are provided a magnetic head and a magnetic disk apparatus wherein an upper magnetic pole is so shaped that, at a position where skew angle is maximum, the maximum of its projected length in the radial direction of a magnetic disk is not more than the track pitch of the magnetic disk, whereby acceleration of thermal relaxation of information recorded on adjacent tracks is obviated even in an area where the skew angle is large.

What is claimed is:  
     
         1 . A method of recording information wherein, at the time of modifying or appending information, the modified or appended information is stored in a sector different from a sector in which previously recorded information is present, without overwriting a part or the entire body of said sector in which said previously recorded information is present.