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公开(公告)号：SG46480A1
公开(公告)日：1998-02-20
申请号：SG1996004997
申请日：1994-12-16
Applicant: IBM
Inventor： NAKAMURA TAKASHI , MUMATA TSUTOMU , OGASAWARA KENJI , KIGAMI YUJI , KURACHI KOJI , OKADA MAYUMI , MATSUI TAKAO , YOKOE YUJI
Abstract: A disk drive having embedded servo information accesses data without using sector identifier recorded in each sector. When a signal sector pulse signal (SP) at the end of a servo area is detected in a dead state during start up, a first data state for the start of a sector transits to a second data state for the litter region of the sector being divided in accordance with the capacity stored in a current sector's pointer register. At the beginning of the sector, the contents of a next sector's pointer register is stored in current sector's pointer register and the contents of a next sector's operation register is stored in a current sector's operation register. Upon completion of sector processing, the first data state is maintained when the next sector is contiguous. When a terminate instruction is stored in current sector's operation register, the process moves to dead state. When the servo area arrives, the process moves to idle state. Responsive to this state, the magnetic head is activated to enable read and write operation for sectors having no sector identifier on the disk.
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公开(公告)号：BR9102008A
公开(公告)日：1991-12-24
申请号：BR9102008
申请日：1991-05-16
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：CA2042871A1
公开(公告)日：1991-11-29
申请号：CA2042871
申请日：1991-05-17
Applicant: IBM
Inventor： MATSUI TAKAO , SONOBE YOSHIAKI
Abstract: JA9-89-018 A MAGNETIC DISK APPARATUS The disclosure deals with magnetic disk apparatus and the reduction of crosstalk and output signal attenuation by the expedient of shifting the positions of the top and bottom magnetic heads. Crosstalk noise is caused by the electromagnetic coupling of the top and bottom heads across a disk. Depending upon signal attenuation and crosstalk ratios, the respective heads are shifted, resulting in a sharp reduction in both attenuation and crosstalk.
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公开(公告)号：CZ283110B6
公开(公告)日：1998-01-14
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：GB2279491A
公开(公告)日：1995-01-04
申请号：GB9411354
申请日：1994-06-07
Applicant: IBM
Inventor： KURACHI KOJI , OHSAWA TOYOMI , MATSUI TAKAO , KIGAMI YUJI
Abstract: The object is to improve the read error rate for identification (ID) information In a sector servo type magnetic disk drive with a head comprising separate read and write elements. A pair of ID fields 21a and 21b are set up in each sector In each track of a magnetic disk for recording ID Information. The pair of ID fields are separated from each other along the track and radially displaced with respect to each other by a distance equal to an offset between the read element 24 and the write element 23 associated with the track. In a data write operation for a trace the magnetic head is positioned so as to read the ID information in the ID field 21b with the read element 23. In a read operation for the track, the head is positioned so as to read the ID information in the ID field 21a with the read element 23.
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Patent Agency Ranking
公开(公告)号：HUT60059A
公开(公告)日：1992-07-28
申请号：HU177291
申请日：1991-05-27
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：CS9101594A3
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
CPC classification number: G11B5/4886 , G11B5/718 , G11B5/7305
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公开(公告)号：DE69128848T2
公开(公告)日：1998-08-13
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：GB2279491B
公开(公告)日：1997-02-05
申请号：GB9411354
申请日：1994-06-07
Applicant: IBM
Inventor： KURACHI KOJI , OHSAWA TOYOMI , MATSUI TAKAO , KIGAMI YUJI
Abstract: The object is to improve the read error rate for identification (ID) information In a sector servo type magnetic disk drive with a head comprising separate read and write elements. A pair of ID fields 21a and 21b are set up in each sector In each track of a magnetic disk for recording ID Information. The pair of ID fields are separated from each other along the track and radially displaced with respect to each other by a distance equal to an offset between the read element 24 and the write element 23 associated with the track. In a data write operation for a trace the magnetic head is positioned so as to read the ID information in the ID field 21b with the read element 23. In a read operation for the track, the head is positioned so as to read the ID information in the ID field 21a with the read element 23.
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公开(公告)号：HU212523B
公开(公告)日：1996-07-29
申请号：HU177291
申请日：1991-05-27
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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