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AssigneeSeagate Technology LLC
InventorsMonty A. Forehand, Paul W. Burnett, Donald B. Douglas, Charles E. Skeldon, Jimmie R. Shaver, Jr., William C. Little, Florence F. Kung, Krishna R. Malakapalli
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An apparatus and method are disclosed for recovering from a header error condition in a disc drive of the type having a rotatable disc having a plurality of concentric tracks with data fields for the storage and retrieval of data and header fields providing logical address information for the data fields. The header fields include read and write header fields which are used during read and write operations, respectively, to align read and write elements of the head with the data fields. When the disc drive unsuccessfully decodes the logical address information from a selected header field associated with a selected data block, an alternate header error recovery routine is performed wherein attempts are made to decode the logical address information from the alternate header field associated with the selected data block. Radial offsets can further be applied to the head to enhance the decoding of the logical address information from the alternate header field.
In a disc drive of the type having a controllably positionable head adjacent a rotatable disc on which a plurality of tracks are defined, the head having separate read and write elements which are physically offset within the head, wherein access operations comprising read and write operations are performed upon data fields of the tracks to retrieve and store user data, respectively, wherein pairs of adjacent first and second header fields independently identify logical addresses for the data fields with a selected one of the first and second header fields used during read operations and a remaining one of the first and second header fields used during write operations, the first and second header fields radially offset on the disc in relation to the physical offset between the read and write elements, a method for performing a selected access operation upon a selected data field after a failure to identify the logical address of the data field from the selected one of the first and second header fields associated with the selected access operation, comprising a step of:
A method for recovering from a header error condition in a disc drive of the type having a rotatable disc and a controllably positionable head adjacent the disc, the head having separate read and write elements which are physically offset within the head, the disc having a plurality of data tracks with data fields used for the storage and retrieval of data by the head, each data field having a pair of adjacent header fields comprising an associated read header field and a separate, associated write header field used during read and write operations, respectively, the read header field and the write header field each independently storing a logical address for the data field and disposed at different radial locations on the disc in relation to the physical offset of the read and write elements, the method comprising steps of:
In a disc drive of the type having a controllably positionable head adjacent a rotatable disc on which a plurality of tracks are defined, the head having separate read and write elements which are physically offset within the head, each track having a plurality of data fields in which user data are stored and a plurality of pairs of associated header fields which provide logical addresses for the data fields, the header fields including read header fields which are accessed by the head during read operations and write header fields which are accessed by the head during write operations, the read and write header fields respectively, radially offset on the disc in relation to the physical offset between the read and write elements, a method for performing a read operation upon a selected data field after the head fails to determine the logical address of the data field from the associated read header field, comprising steps of:
In a disc drive of the type having a controllably positionable head adjacent a rotatable disc on which a plurality of tracks are defined, the head having separate read and write elements which are physically offset within the head, each track having a plurality of data fields in which user data are stored and a plurality of pairs of associated header fields which provide logical addresses for the data fields, the header fields including read header fields which are accessed by the head during read operations and write header fields which are accessed by the head during write operations, the read and write header fields respectively, radially offset on the disc in relation to the physical offset between the read and write elements, a method for performing a write operation upon a selected data field after the head fails to determine the logical address of the data field from the associated read header field, comprising steps of:
A disc drive, comprising:
Dependencies are inferred from the claim text.