Self-servo cutting method and device capable of eliminating repeatable eccentric error

Abstract

A method for eliminating eccentric error by utilizing self-servo write-in means includes confirming data value of disc swinging deviation, generating data calibration table of disc swinging deviation as per confirmed data value, confirming control parameter, generating new servo information according to said control parameter and to said calibration table then writing new servo information in disc. The device used for realizing said methods is also disclosed.

Description

technical field [0001] The present invention relates to the technical field of self-servo writing, in particular to a method and device for self-servo writing that eliminates repeatable runout errors (RRO, repeatable runout). Background technique [0002] The track of the hard disk is composed of a fixed number of sector information, the sector information includes: servo guide information AGC (Auto gain calibration), STM (servo track mark), track number (Track number), sector number (Sector number ) and positioned Bursts. The sector information is also called servo information. In order to improve work efficiency, the servo information is generally written into the hard disk on the servo writer at the present stage, and then the head-disk assembly (HDA) assembled by the disk and the magnetic head is installed on the directly on the hard disk. [0003] When writing and reading servo information on the disk, in the most ideal case, the writing head of the servo writing mach...

AI Technical Summary

Problems solved by technology

[0003] When writing and reading servo information on the disk, in the most ideal case, the writing head of the servo writing machine and the magnetic head of the head-disk assembly in the hard disk should move on the same trajectory on the disk, both A standard full circle, but this is not the case in reality. After the servo writing machine writes the servo information on the disc, the disc needs to be installed in the head-disk assembly. Since the servo writing machine is combined with the head-disk The environment of the body is different, and the force on the center of the disc in the above two different environments is different, so that the centers of the discs in the above two different environments cannot coincide, resulting in the problem of repeatable eccentricity error (RRO) , that is, because the centers of the disks in the above two environments are inconsistent, after the writing head of the servo writing machine writes information on the disk, when the magnetic head of the hard disk itself writes the servo information written on the disk When reading, the magnetic head must keep moving to track and read the servo information, and the moving track of the magnetic head on the disk is not a standard circle, resulting in large power consumption, reduced positioning accuracy of the magnetic head, The reading and writing quality of the hard disk is significantly reduced under the condition of large external interference

[0004] When performing servo writing, the head deflection caused by the installation of each disk is different, and various non-repeatable interference factors in the writing environment will have a certain impact on writing when performing servo writing. The technical scheme of the impact of the above-mentioned interference factors; meanwhile, the prior art generally utilizes control system feed-forward compensation to reduce such repeatable deviations that the disk exists, but this increases the complexity of the control system and sacrifices some dynamic qualities of the system; At the same time, it also restricts us to write higher density servo information, and it does not solve the above-mentioned problems that the magnetic head needs to keep moving to track and read the servo information. The problem that the quality of reading and writing is significantly reduced under the environment of interference

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