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公开(公告)号：PL166646B1
公开(公告)日：1995-06-30
申请号：PL29044991
申请日：1991-05-28
Applicant: IBM
Inventor： MATSUI TAKAO , SONOBE YOSHIAKI
Abstract: Described is a magnetic disk apparatus including at least one magnetic disk 1 comprising a glass or ceramic substrate. Magnetic heads (3a, 3b) are arranged on opposite surfaces of the disk and are shifted with respect to one another in a radial direction. This shifting reduces the amount of crosstalk and signal deterioration caused by the electromagnetic coupling of the two heads.
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公开(公告)号：GB2285165A
公开(公告)日：1995-06-28
申请号：GB9425465
申请日：1994-12-16
Applicant: IBM
Inventor： NAKAMURA TAKASHI , NUMATA TSUTOMU , OGASAWARA KENJI , KIGAMI YUJI , KURACHI KOJI , OKADA MAYUMI , MATSUI TAKAO , YOKOE YUJI
Abstract: A disk drive apparatus comprising a disk recording medium in which each track is divided into a servo area which stores information for identifying the track position and a plurality of data sectors wherein at least one of said data sectors crosses said servo area and a look-up table is provided for identifying the position of each sector based upon the relationship between a physical sector identifier, said position information and the capacity of the sector crossing said servo area. When a signal SP at the end of a servo area is detected in a dead state 80 during start up, a first data state 84 for the start of a sector transits to a second data state 86 for the later region of the sector being divided in accordance with the capacity stored in a current sectors pointer register 60. At the beginning of the sector, the contents of a next sectors pointer register 62 is stored in register 60 and the contents of a next sectors operation register 66 is stored in a current sectors operation register 64. Upon completion of sector processing, the first data state 84 is maintained when the next sector is contiguous. When a terminate instruction is stored in register 64, the process moves to dead state 80. When the servo area arrives, the process moves to idle state 82. Responsive to this state, the magnetic head is activated to enable read and write operation 5 for sectors having no sector ID on the disk.
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公开(公告)号：CS159491A3
公开(公告)日：1992-02-19
申请号：CS159491
申请日：1991-05-28
Applicant: IBM
Inventor： MATSUI TAKAO , SONOBE YOSHIAKI
Abstract: Described is a magnetic disk apparatus including at least one magnetic disk 1 comprising a glass or ceramic substrate. Magnetic heads (3a, 3b) are arranged on opposite surfaces of the disk and are shifted with respect to one another in a radial direction. This shifting reduces the amount of crosstalk and signal deterioration caused by the electromagnetic coupling of the two heads.
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公开(公告)号：DE69128848D1
公开(公告)日：1998-03-12
申请号：DE69128848
申请日：1991-05-24
Applicant: IBM
Inventor： MATSUI TAKAO , SONOBE YOSHIAKI
Abstract: Described is a magnetic disk apparatus including at least one magnetic disk 1 comprising a glass or ceramic substrate. Magnetic heads (3a, 3b) are arranged on opposite surfaces of the disk and are shifted with respect to one another in a radial direction. This shifting reduces the amount of crosstalk and signal deterioration caused by the electromagnetic coupling of the two heads.
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公开(公告)号：PL290449A1
公开(公告)日：1992-01-13
申请号：PL29044991
申请日：1991-05-28
Applicant: IBM
Inventor： MATSUI TAKAO , SONOBE YOSHIAKI
Abstract: Described is a magnetic disk apparatus including at least one magnetic disk 1 comprising a glass or ceramic substrate. Magnetic heads (3a, 3b) are arranged on opposite surfaces of the disk and are shifted with respect to one another in a radial direction. This shifting reduces the amount of crosstalk and signal deterioration caused by the electromagnetic coupling of the two heads.
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Patent Agency Ranking
公开(公告)号：AU7616891A
公开(公告)日：1991-11-28
申请号：AU7616891
申请日：1991-04-29
Applicant: IBM
Inventor： SONOBE YOSHIAKI , MATSUI TAKAO
Abstract: Described is a magnetic disk apparatus including at least one magnetic disk 1 comprising a glass or ceramic substrate. Magnetic heads (3a, 3b) are arranged on opposite surfaces of the disk and are shifted with respect to one another in a radial direction. This shifting reduces the amount of crosstalk and signal deterioration caused by the electromagnetic coupling of the two heads.
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17.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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公开(公告)号：JPH07320248A
公开(公告)日：1995-12-08
申请号：JP10878194
申请日：1994-05-23
Applicant: IBM
Inventor： KUROKI KENJI , MATSUI TAKAO
Abstract: PURPOSE: To reduce the non-detection and erroneous detection of information. CONSTITUTION: A controller body 40 for an HDC 30 is connected to a driving device 28, and an arm is turned at a fixed angle. A magnetic head 20A functioning as an MR head placed at the front end of the arm and consisting of a recording element and a reproducing element is supplied with a bias current through a driver 36A and a switch circuit 32A from the main body 40, and the magnetic field of a disk 18A is detected by a detector 38A through the switch circuit 32A. The switch circuit 32A inverts the polarity of a current fed to the magnetic head 20A by a signal from the controller body 40 corresponding to a skew angle. Accordingly, the direction of a bias magnetic field is changed, the effective sensibility place of the reproducing element is brought near to the recording element, and an offtrack can be reduced.
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公开(公告)号：JPH07211000A
公开(公告)日：1995-08-11
申请号：JP31878093
申请日：1993-12-17
Applicant: IBM
Inventor： KIGAMI YUJI , YOKOE YUJI , NUMATA TSUTOMU , NAKAMURA TAKASHI , OGASAWARA KENJI , KURACHI KOJI , MATSUI TAKAO , OKADA MAYUMI
Abstract: PURPOSE: To refer to information on constitution or the like for respective sectors and to increase information quantity by permitting a hard disk controller to calculate an absolute block address to calculate a physical position in a specified zone and executing a seek operation based on the physical position. CONSTITUTION: The hard disk controller HDC 30 refers to a defect list D-LST and calculates the absolute block address ABA by all the sectors, which corresponds to a designated logic block address LBA. When a host computer requests the reading of the sectors from #L to #M in the address LBA, the absolute block address ABA is calculated to be #N. When the belonging zone Zn is set to be #Z, the min address ABA is to be MIN-ABBA(#Z) and a min cylinder is MIN-CYL(#Z), the address ABA is shown by an expression. Then, #ZN is set to be the serial numbers of the sectors. The head is switched and the seek operation is executed based on the physical position which is thus calculated.
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公开(公告)号：JPH0432001A
公开(公告)日：1992-02-04
申请号：JP13550690
申请日：1990-05-28
Applicant: IBM
Inventor： MATSUI TAKAO , SONOBE YOSHIAKI
Abstract: PURPOSE: To reduce the crosstalk noise and the deterioration of signal output by arranging to shift the position of a pair of upper/lower magnetic disks holding a glass substrate magnetic disk therebetween. CONSTITUTION: The substrate of the magnetic disk 1 consists of glass, and the magnetic layers are vapor-deposited on the upper surface and lower surface sides of this substrate. The 1st magnetic head 2a is arranged on the upper surface side of this magnetic disk 1 and supported by a 1st slider 3a. Also, the 2nd magnetic head 2b is arranged on the lower surface side of the magnetic disk 1 and supported by a 2nd slider 3b. Then, the 1st magnetic head 2a and the 2nd magnetic head 2b are arranged so that the recording tracks are shifted by (d). By this arrangement, the attenuation amount of signal output and the crosstalk noise are remarkably reduced without forming a shield layer on the substrate of the magnetic disk 1.
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