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公开(公告)号：JPH11191201A
公开(公告)日：1999-07-13
申请号：JP35689697
申请日：1997-12-25
Applicant: IBM
Inventor： SUZUKI HIROMASA , KURACHI KOJI , SUDA KATSUMI , ASANO HIDEO , OKADA KENJI , TAKASE MAKOTO , KIHASHI AKIRA , NISHINOMIYA HIROMI , MATSUI TAKAO , ENDO TATSUYA , KUROKI KENJI
Abstract: PROBLEM TO BE SOLVED: To improve the performance of an information recording/reproducing device using a GMR(giant magnet resistance) sensor. SOLUTION: This method aims at the restoration of an operating error generated in an information recording/reproducing device including a storage medium, a head using a GMR sensor, an actuator arm for mounting the head and locating the head on a prescribed position on the front surface of the storage medium and a control part for controlling the operation of the actuator arm and read/write operation. At this time, it comprises a step for executing a first error restoring procedure 103, a step for executing a first GMR evaluating procedure 109 for evaluating the performance of the GMR sensor when the operating error is not restored in the first error restoring procedure and a step 117 for impressing a reset pulse to the GMR sensor in accordance with the first GMR evaluating procedure.
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公开(公告)号：JPH097148A
公开(公告)日：1997-01-10
申请号：JP24283295
申请日：1995-09-21
Applicant: IBM
Inventor： NAKAMURA TAKASHI , YONEDA ISAO , YOKOE YUJI , TSUNAKO KAZUJI , HARAKO FUJIO , SUDA KATSUMI , NAKAJIMA MICHIO , OGASAWARA KENJI
Abstract: PROBLEM TO BE SOLVED: To eliminate an error due to thermal asperity by detecting a read defect on a data recording surface, varying the rotating speed of a disk and making a signal transducer which has decreased in flotation quantity collide, and breaking a projection as the thermal asperity. SOLUTION: Once the signal transducer 20 equipped with an air bearing surface(ABS) 44 and a magneto-resistive(MR) element 42 detects the projection 52 as the thermal asperity of the magnetic disk 18, the rotating speed of the disk is reduced. The ABS 44 of the signal transducer 20 which has decreased in flotation quantity by the speed reduction collides against the projection 52, which is broken, thereby eliminating the read error due to the thermal asperity.
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公开(公告)号：DE69602486D1
公开(公告)日：1999-06-24
申请号：DE69602486
申请日：1996-03-26
Applicant: IBM
Inventor： NAKAMURA TAKASHI , YONEDA ISAO , YOKOE YUJI , TSUWAKO KAZUSHI , HARAKO FUJIO , SUDA KATSUMI , NAKAJIMA MICHIO , OGASAWARA KENJI
Abstract: The present invention provides a disk drive apparatus which detects when a signal transducer head contacts a projection, forming a thermal asperity on the recording surfaces of disks, makes the flying height of the signal transducer head lower by changing the rotation speed from the normal rotation speed in read/write operations or by transforming a suspension having a bimetal structure while said signal transducer head is positioned over the detected projection on the track, and makes the signal transducer head strike against the projection to break the projection.
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公开(公告)号：DE69602486T2
公开(公告)日：1999-12-09
申请号：DE69602486
申请日：1996-03-26
Applicant: IBM
Inventor： NAKAMURA TAKASHI , YONEDA ISAO , YOKOE YUJI , TSUWAKO KAZUSHI , HARAKO FUJIO , SUDA KATSUMI , NAKAJIMA MICHIO , OGASAWARA KENJI
Abstract: The present invention provides a disk drive apparatus which detects when a signal transducer head contacts a projection, forming a thermal asperity on the recording surfaces of disks, makes the flying height of the signal transducer head lower by changing the rotation speed from the normal rotation speed in read/write operations or by transforming a suspension having a bimetal structure while said signal transducer head is positioned over the detected projection on the track, and makes the signal transducer head strike against the projection to break the projection.
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