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Patent Agency Ranking
公开(公告)号：DE3873904D1
公开(公告)日：1992-09-24
申请号：DE3873904
申请日：1988-12-19
Applicant: IBM
Abstract: A method and apparatus for detecting abnormal operation in a magnetic disk file which comprises reading data for each head and each track to obtain a readback signal. The readback signal is read from a predetermined area of each track on a disk that is not normally rewritten during normal operation of the system. The amplitude of the signal read from one track is compared with the amplitude of the signals read from other tracks, and an alarm condition when the comparison indicates a variation which exceeds a predetermined level. Corrective action can be taken in response to the alarm condition prior to an actual failure condition in the magnetic disk file.
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公开(公告)号：SG66394A1
公开(公告)日：1999-07-20
申请号：SG1997003164
申请日：1997-08-29
Applicant: IBM
Inventor： LEE EDWARD HINPONG , PHIPPS PETER BEVERLEY POWELL
Abstract: The front edge of the a zero throat height (ZTH) defining insulation layer in a magnetic head is formed with a central portion which is centered with respect to a second pole tip with first and second lateral portions which are on each side of the central portion and parallel to the ABS. The central portion is recessed from the ABS a distance appropriate for defining the ZTH between the first and second pole pieces of the head and the first and second lateral edges are further recessed into the head so as to increase the volume of the overcoat layer between the ABS and the first and second lateral edges. The increased volume of the overcoat layer better absorbs stresses and strains due to shock loading and temperature so as to reduce cracking of the head at the ABS.
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公开(公告)号：DE3873904T2
公开(公告)日：1993-03-11
申请号：DE3873904
申请日：1988-12-19
Applicant: IBM
Abstract: A method and apparatus for detecting abnormal operation in a magnetic disk file which comprises reading data for each head and each track to obtain a readback signal. The readback signal is read from a predetermined area of each track on a disk that is not normally rewritten during normal operation of the system. The amplitude of the signal read from one track is compared with the amplitude of the signals read from other tracks, and an alarm condition when the comparison indicates a variation which exceeds a predetermined level. Corrective action can be taken in response to the alarm condition prior to an actual failure condition in the magnetic disk file.
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