Method for characterizing a read head based on write-induced mag

Details Method for characterizing a read head based on write-induced mag Method for characterizing a read head based on write-induced mag

1997-03-18

1999-06-22

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

059145943

ABSTRACT:
A method for characterizing a head in a hard drive assembly based on a magnetic read center shift and a read sensitivity change of the head. A disk attached to a hard disk drive assembly having a plurality of tracks each having a track centerline is provided. One of the tracks has a plurality of sectors, one of the sectors having a servo field with an A burst, a B burst and a C burst, where the A burst and the C burst have a common boundary located at a track centerline and where 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 a write excitation field is applied to the write element. The amplitudes of an A burst and a C burst located in a following sector of the track are then read to provide an A burst amplitude value and a C burst amplitude value. The steps of writing and reading are repeated for a predetermined number of times to obtain a set of A burst amplitude values and a set of C burst amplitude values. A value representing an instability of the read element based on the set of A burst amplitude values and the set of C burst amplitude values is then calculated. The head is characterized based on the value.

REFERENCES:
patent: 5760982 (1998-06-01), Stien

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