Magnetic recording disk drive with shingled writing and wide-area thermal assistance

A disk drive, magnetic recording technology, applied in the direction of magnetic recording, recording of information on a magnetic disk, data recording, etc.
CN102779528AInactive Publication Date: 2012-11-14HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
Publication Date
2012-11-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention provides a thermally-assisted recording (TAR) disk drive using a 'wide-area' heater with 'shingled' recording. In shingled recording, the write head pole tip is wider than the read head in the cross-track direction and writes magnetic transitions by making a plurality of consecutive circular paths that partially overlap. The non-overlapped portions of adjacent paths form the data tracks, which are thus narrower than the width of the write pole tip. The data tracks are grouped into annular bands and when data is to be rewritten, all of the data tracks in an annular band are also rewritten. The wide-area heater may be a waveguide with an output end that generates a heated area on the disk recording layer which is wider than the cross-track width of the write pole tip. It has been determined that the use of a wide-area heater with shingled recording does not result in any significant adjacent track erasure (ATE).
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Description

technical field

[0001] This invention relates generally to thermally assisted recording (TAR) systems in which data is written while the magnetic recording layer is at an elevated temperature, and more particularly to TAR disk drives having "wide area" heaters that heat An area of ​​the disc that is wider than the data tracks to be recorded. Background technique

[0002] In a magnetic recording disk drive, the magnetic material (or medium) used for the recording layer on the disk is chosen to have sufficient coercivity so that the magnetized data regions defining the "bits" of data are written precisely and maintain their magnetization state until overwritten by a new data bit. As areal data density (the number of bits that can be recorded per unit surface area of ​​the disc) increases, the magnetic grains that make up the data bits can be so small that they can demagnetize simply due to thermal instabilities or disturbances within the magnetized bits (The so-called "super...

Claims

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