Magnetic disk apparatus and data recording method

A magnetic disk apparatus comprising:

• a magnetic disk having a plurality of tracks, each of the plurality of tracks comprising a plurality of servo areas including position information and a plurality of data areas, the plurality of servo areas and the plurality of data areas being alternately arranged respectively;
• a magnetic head for writing and reading data relative to the magnetic disk;
• and
• a processor, wherein
• when recording data in a data area of a first track, by reading the position information of the servo areas of the first track by the magnetic head, the processor detects a positioning error indicating difference from a target writing position of the first track for each of the servo areas,
• stores the detected positioning error for each of the servo areas in a storage portion,
• when a plurality of positioning errors related to one servo area are present in the positioning errors of the first track in the storage portion, updates the positioning error of the one servo area with a positioning error closest to a second track that is next to the first track, and
• writes data in the second track by a shingled write recording system by using the updated positioning error.