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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
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.
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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：JPH1139777A
公开(公告)日：1999-02-12
申请号：JP18875197
申请日：1997-07-14
Applicant: IBM
Inventor： ASANO HIDEO , SUZUKI HIROMASA
Abstract: PROBLEM TO BE SOLVED: To shorten the time till a read status by including a step starting the revolution of a data recording disk by responding to a power-on and increasing its rotational speed, a step fixing the rotational speed of the disk at an intermediate rotational speed and a step reading the control program stored on the data recording disk to store it in a memory and transmitting a preparation completion signal to a host processor. SOLUTION: The recording surface of a magnetic recording disk 10 is divided into an area 10A including a special track on which a control program is to be recorded and an area 10B including data tracks which are to be accessed by ordinary read/write operations. The operation of the disk is started by using the control program stored in the ROM 16A being in a main control circuit MPU 16. There are a first intermediate rotational speed of 4500 rpm, a second intermediate rotational speed of 5400 rpm and a final rotational speed of 7200 rpm as rotational speeds of the disk. The remaining of the control program is recorded on the special track of the area 10A and it is down loaded in the RAM 17B of a memory 17.
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公开(公告)号：JPH0935397A
公开(公告)日：1997-02-07
申请号：JP17710195
申请日：1995-07-13
Applicant: IBM
Inventor： SUZUKI HIROMASA , KIBASHI AKIRA , YAMAMOTO YOSHIO , ASANO HIDEO
IPC: G11B23/50 , G11B5/00 , G11B5/012 , G11B5/54 , G11B5/55 , G11B5/58 , G11B19/04 , G11B21/08 , G11B21/21 , G11B19/02
Abstract: PROBLEM TO BE SOLVED: To eliminate the elementary cause of a thermal asperity by repeatingly perform a one directional seeking operation and eliminating a projected matter while actively bringing the surface of the structural body of a head into contact with the projected matter. SOLUTION: A head slider 20 is inclined with respect to the rotational direction of a disk by the air pressure accompanied by the revolution of the disk. The head slider 20 is brought into contact with the projected matter 52 on the disk 18 at the point of an ABS surface 44 nearest to the disk. Besides, for example, the number of loopings is defined to be two, seeking operations are completed when the loopings are repeated two times and a retry, that is, a rereading operation is executed to confirm whether a normal reading operation is performed or not. When the projected matter is eliminated by these seeking operations, since a read signal becomes normal and errors are recovered, this device can move to an ordinary reading or writing operation.
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Patent Agency Ranking5.发明专利
公开(公告)号：JPH11195210A
公开(公告)日：1999-07-21
申请号：JP35791297
申请日：1997-12-25
Applicant: IBM
Inventor： MATSUI TAKAO , ENDO TATSUYA , SUZUKI HIROMASA , YAMAGUCHI KATSUJI , KUROKI KENJI , ASANO HIDEO
Abstract: PROBLEM TO BE SOLVED: To provide the method in which an initialization of a great magneto resistance(GMR) head and a reset are executed and to provided the device for executing the method. SOLUTION: The yield of the GMR head is improved by executing the initialization, in which the magnetization direction of the free layer of the GMR head (mounted on the hatched surface of a slider 14) is directed by an external magnetic field, and is executed in the opposite direction again. Moreover, a discrimination is made to determine whether the magnetization direction of a pin stopping layer of the head is temporarily reversed or not and damaged GMR head is selected in an early stage. Then, the magnetization direction of the layer is returned in a positive direction, a semi-static test is conducted to check the reproduced response of the head and a safe efficient reset is executed. The reset is conducted by not only applying a pulse but also is executed while applying an external magnetic field in the pin stopping direction or only applying a strong magnetic field. Note that a tool 500 is commonly used throughout the process levels for an initialization, a reset and a reproducing response.
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6.发明专利
公开(公告)号：JP2001243611A
公开(公告)日：2001-09-07
申请号：JP2000047042
申请日：2000-02-24
Applicant: IBM
Inventor： SUZUKI HIROMASA , UMEMURA KAORU , SHIBATA AKIRA , ENDO TATSUYA , MATSUI TAKAO , IKEDA MASAOMI , HASHIMOTO JUNJI
Abstract: PROBLEM TO BE SOLVED: To reduce reproduction errors by improving the setting accuracy of a reproduction offset generated between the recording head and the reproducing head of a compound type head part. SOLUTION: The recording head records a test pattern on a plurality of tracks to be measured (S2), the amplitude of a regenerative signal by the reproducing head is measured at a plurality of different tracking positions about the respective tracks to be measured (S5), the approximate expression of a profile of the measured amplitude with respect to the tracking positions is found (S6), a position where a maximum value is given in the approximate expression is calculated as a tracking position at which the amplitude of the regenerative signal is maximum, a reproduction offset is calculated on the basis of the tracking position with the maximum amplitude (S7), and the reproduction offset of an optional track is set in a disk device on the basis of the reproduction offset about the tracks to be measured (S10).
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公开(公告)号：JPH09167303A
公开(公告)日：1997-06-24
申请号：JP33030095
申请日：1995-12-19
Applicant: IBM
Inventor： OKADA KENJI , ARAI KOICHI , TSUNODA HISASHI , SUZUKI HIROMASA , SASAKI MASAKAZU , KIHASHI AKIRA , ENDO TATSUYA
Abstract: PROBLEM TO BE SOLVED: To eliminate generation of thermal asperity and to avoid generation of error by making head vibration have a directional component approaching the disk surface. SOLUTION: When an error is generated, a vibration signal from a means 52 is superposed on a signal from a controller 43 by a direction of HDC and supplied to a VCM driving means 45. And a head 20 is positioned at a desired position according to thermal asperity position. By providing the VCM 46 with a vibration signal, a head assembly starts rolling movement centering the joint point with a dimple. And the head assembly generates vertical vibration with a frequency equivalent to the given vibration signal frequency, and eliminate the thermal asperity on the disk.
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公开(公告)号：JPH10161818A
公开(公告)日：1998-06-19
申请号：JP30774396
申请日：1996-11-19
Applicant: IBM
Inventor： SUZUKI HIROMASA , ASANO HIDEO , TOBARI ATSUSHI , NISHINO SATOSHI , YAMADA HIDEJI , ANDO HARUO , KOWA TSUGUAKI
Abstract: PROBLEM TO BE SOLVED: To provide a method/device which can assure execution of an ERP (error recovery procedure) up to its last step regardless of the time needed up to the time-out of an instruction and can more surely recover an error. SOLUTION: A disk device carries out an ERP up to its last step or until an error is recovered with no interruption when a reset instruction is received during execution of the ERP. In another mode, the disk device stops execution of the ERP and also holds the number K of the step whose execution is over right before reception of a reset instruction when this instruction is received during execution of the ERP. Then the disk device successively carries out the ERP from the (K+1)th error recovery step when a retry instruction is received.
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9.发明专利
公开(公告)号：JPH08279262A
公开(公告)日：1996-10-22
申请号：JP7514995
申请日：1995-03-31
Applicant: IBM
Inventor： SUZUKI HIROMASA , OGASAWARA KENJI , KAWAMURA MASAHARU , KURACHI KOJI
Abstract: PURPOSE: To increase reliability in a servo without decreasing a data area, etc., by a method wherein a servo compensation signal is written using a write retrieval area. CONSTITUTION: A plurality of servo areas 50 are radially formed along a radius direction of a disk in a data area 52 on each recording face of the disk, a gray code (a cyclic binary-code) showing an address of a data track is recorded therein corresponding to the data track, and further a burst pattern serving as a signal for positioning for a track of a head is recorded. The track is formed at a specific pitch P in the data track area 52, and a plurality of data are recorded in the track accompanied by an ID being each identifying data. A servo compensation signal area 53 is formed in a position interposed between the data area 52 and the servo area 50. This compensates a servo signal for the servo area and enables an error retrieval when a read error etc., generates in the servo area.
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