Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data verification
Patent
1993-07-30
1994-07-19
Hajec, Donald
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data verification
360 31, G11B 2736, G11B 509
Patent
active
053314760
ABSTRACT:
A tape drive data storage apparatus incorporates an error recovery system that is dynamically controlled to perform knowledge-based error recovery in accordance with a novel error recovery method. As the tape drive apparatus performs read and/or write data transfer operations on a tape medium loaded in the tape drive, an error recovery knowledge base is generated representing a tape map of ECC error correction locations on the tape medium. If error recovery is initiated and it is determined from the tape map that one or more error clustering thresholds have been reached in one or more selected regions of the tape medium, appropriate error recovery action is taken depending on whether a data read or data write operation is underway. If read (or write) data is being processed, the error recovery procedures performed by the error recovery system can be selectively modified in the affected tape medium regions to address the expected cause(s) of the data error. If write data is being processed, the affected tape regions can be demarked so that data is not written thereon during subsequent write operations. In this way, error recovery and data transfer operations can be tailored based on knowledge that localized media defects have been found.
REFERENCES:
patent: 4870645 (1989-09-01), Herron
patent: 4908826 (1990-03-01), Hertrich
patent: 5050018 (1991-09-01), Georgis et al.
patent: 5251077 (1993-10-01), Saitoh
patent: 5262905 (1993-11-01), Takagi et al.
Fry Scott M.
Lee Michael M.
Nylander-Hill Pamela R.
Paranjape Sushama M.
Hajec Donald
International Business Machines - Corporation
Kim Won Tae C.
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