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公开(公告)号：DE69328853T2
公开(公告)日：2000-12-07
申请号：DE69328853
申请日：1993-09-13
Applicant: IBM
Inventor： CANDELARIA SUSAN KAY , HANSON DEAN LEE , KWOK ROBERT LAM , LANE KENNETH WAYNE , NORDAHL DONALD MARVIN , REID MARK ALBERT , SHERMAN II WILLIAM GRISWOLD
Abstract: A method and system for enhancing efficiency of data accessing within a storage subsystem, preferably including a DASD with multiple disks, which is coupled to a host system via a storage subsystem controller. Recording tracks are accessed utilizing multiple switchable transducer heads. A signal transmitted from the host system is utilized to define a transducer head switching table within the storage subsystem controller listing each track to be accessed and an associated control parameter for selecting a particular transducer head to be utilized to access a subsequent track. Each time the end of an accessed track is encountered, this table is accessed and the control parameter associated with that track is accessed and coupled to the DASD in order to select a subsequent track for access. A pointer is established into this table at the listing of an initially accessed track and access may be terminated when that pointer is encountered.
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公开(公告)号：DE69328853D1
公开(公告)日：2000-07-20
申请号：DE69328853
申请日：1993-09-13
Applicant: IBM
Inventor： CANDELARIA SUSAN KAY , HANSON DEAN LEE , KWOK ROBERT LAM , LANE KENNETH WAYNE , NORDAHL DONALD MARVIN , REID MARK ALBERT , SHERMAN II WILLIAM GRISWOLD
Abstract: A method and system for enhancing efficiency of data accessing within a storage subsystem, preferably including a DASD with multiple disks, which is coupled to a host system via a storage subsystem controller. Recording tracks are accessed utilizing multiple switchable transducer heads. A signal transmitted from the host system is utilized to define a transducer head switching table within the storage subsystem controller listing each track to be accessed and an associated control parameter for selecting a particular transducer head to be utilized to access a subsequent track. Each time the end of an accessed track is encountered, this table is accessed and the control parameter associated with that track is accessed and coupled to the DASD in order to select a subsequent track for access. A pointer is established into this table at the listing of an initially accessed track and access may be terminated when that pointer is encountered.
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公开(公告)号：SG42879A1
公开(公告)日：1997-10-17
申请号：SG1996000396
申请日：1994-05-19
Applicant: IBM
Inventor： FUNG KWOK WING , KWOK ROBERT LAM , PATEL ARVIND MOTIBHAI , RUTLEDGE ROBERT ANTHONY
Abstract: A direct access storage device (DASD) system uses a read/write head having a wide transducer write element (110) and a narrow magneto-resistive read element (112). In order to avoid mistakenly reading a incompletely erased old data field (202), the system uses a verification procedure. The data is read at two positions along the data track which are separated by a radial distance D. This distance D is selected to be greater than the width of any incompletely erased data record. If the data read at the two read positions is equal, then the data is deemed to be correct and is sent to a host system 70.
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