Disk device and writing method

Abstract

According to one embodiment, a magnetic disk device includes a memory, a disk including track groups each including overlapping tracks, a head including a write head, and a read head, and a controller configured to write first position data, including a first position error of the write head with respect to a first target track, to the memory and a second recording area subsequent to a first recording area to which first data is written, when writing the first data to the track groups, to read the first position data from the memory or the second recording area when adding data after writing the first data, and to control a position of the write head based on the first position data.

Description

[0001] This application claims Japanese Patent Application No. 2015-256892 (filing date: December 28, 2015) as the priority of the earlier application. This application incorporates this earlier application in its entirety by reference. technical field [0002] Embodiments of the present invention relate to a magnetic disk device and a writing method. Background technique [0003] In recent years, various technologies have been developed to increase the recording capacity of magnetic disk devices (such as HDDs). As one of such techniques, there is a recording technique called Shingled write Magnetic Recording (SMR, Shingled Write Magnetic Recording) or Shingled Write Recording (SWR, Shingled Write Recording)). In a magnetic disk device of a tile recording system, when data is written to a magnetic disk, data is written in the next recording track so as to partially overlap an adjacent track (hereinafter referred to as an adjacent track). By adopting this tile recording met...

AI Technical Summary

Problems solved by technology

[0006] In a magnetic disk device of the tile recording method, when a track width control function such as DDOL and / or ATC is separately executed for multiple data streams, it becomes difficult to manage each position information for a plurality of band areas using only a memory.

In addition, in the magnetic disk device of the tile recording method, when new data is written after the already written data by a track width control function such as DDOL / ATC, each position for a plurality of band areas is managed only by the memory. information becomes difficult

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