Patent ID: 9240198
Filing Date: 2016-01-19
CPC Classification: G11B

Claim Text:
1. A magnetic disk drive, comprising: a magnetic disk comprising a plurality of servo areas for detecting a positioning error; a magnetic head to write and to read data to and from the magnetic disk; and a processor, wherein the processor detects a current positioning error of the magnetic head on the magnetic disk, while writing data to tracks of the magnetic disk so as to partially overlap with each other by the magnetic head, calculates a predicted positioning error in a next servo area to a current servo area where current positioning error is detected, executes write inhibit determination, based on comparison between the current positioning error and a first threshold value, and wherein when the current positioning error is equal to or smaller than the first threshold value, when the predicted positioning error is greater than a second threshold value different from the first threshold value, and when a direction of the predicted positioning error is same as a direction of the writing, the processor sets the first threshold value to a smaller value by a specific amount, the smaller value being used as the first threshold value in the write inhibit determination in the next servo area.