Patent ID: 9728215
Date: 2017-08-08
CPC Classifications: G11B

Claim:
1. A magnetic disk apparatus, comprising: a magnetic disk in which a plurality of tracks are defined, each of the tracks alternately comprising a plurality of data regions and servo regions including burst information for detecting a positioning error; a magnetic head writing and reading data for the magnetic disk; and a processor, wherein the processor is configured: to read, at data recording in a data region of a predetermined track, servo regions of the predetermined track by the magnetic head, and to detect a positioning error indicating displacement from a target write position of the predetermined track, for each of the servo regions; if data recording to a first track group on the magnetic disk is interrupted and data recording to a second track group is executed, to record a positioning error of a track where the data recording is last executed in the first track group, in a region on the magnetic disk; and if the data recording to the first track group is restarted, to reproduce the positioning error recorded in the region on the magnetic disk, and to record data subsequent to a portion where the data recording is interrupted, by using the magnetic head, in a shingled recording, to prevent the data recorded in the first track group from being overwritten by using the reproduced positioning error.