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

IPC: G11B5/60 ,  G11B19/04 ,  G11B19/20 ,  G11B23/50 ,  G11B21/21 ,  G11B27/36 ,  G11B5/48

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.

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

IPC: G11B5/60 ,  G11B19/04 ,  G11B19/20 ,  G11B23/50 ,  G11B21/21 ,  G11B27/36 ,  G11B5/48

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.

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

IPC: G11B5/60 ,  G11B19/04 ,  G11B19/20 ,  G11B23/50

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.

公开(公告)号：JP2002298307A

公开(公告)日：2002-10-11

申请号：JP2001097183

申请日：2001-03-29

Applicant: IBM

Inventor： SUZUKI HIROMASA ,  ASANO HIDEO ,  NAGANO ARIYOSHI ,  NAKAJIMA MICHIO ,  IKEDA MASAOMI ,  MURAI MASASHI

IPC: G11B5/027 ,  G11B5/00 ,  G11B5/012 ,  G11B5/035 ,  G11B5/09

Abstract: PROBLEM TO BE SOLVED: To improve the overwrite performance in the initial stage of write. SOLUTION: A write current W1 which is obtained by adding a boost current (Wboost) to a nominal current (Wnom) is supplied to a write head in the initial stage of the write, and after that time, the write current W2 consisting of the nominal current (Wnom) is supplied to the write-head.