Electricity: measuring and testing – Magnetic – Magnetic information storage element testing
Patent
1999-02-19
2000-02-15
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Magnetic information storage element testing
360 31, 369 53, 369 55, G01R 3312, G11B 2736, G11B 509, G04C 1304
Patent
active
060257121
ABSTRACT:
The present invention relates to a method for characterizing a head in a hard drive assembly, in which the head has a write element. The method comprises providing a disk attached to a hard disk drive assembly, the disk having a plurality of tracks each having a track centerline. One of the tracks has a plurality of sectors. One of the sectors has a servo field with an A burst, a B burst and a C burst, where the A burst and the C bursts have a common boundary located at a track centerline and where the B burst has a center that is positioned along the track centerline. Each sector also has a data field. The read element is aligned with the B servo burst, and data is written in a data field of a first sector of one of the tracks. An A burst and a C burst located in a following sector of one of the tracks is read to provide an A burst amplitude value and a C burst amplitude value. A characteristic of the read element based on the A burst amplitude value and the C burst amplitude value is then determined.
REFERENCES:
patent: 5914594 (1999-06-01), Mian
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SamSung Electronics, Ltd.
Snow Walter E.
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