Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data in specific format
Patent
1993-03-01
1995-02-07
Hajec, Donald
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data in specific format
360 50, 360 721, 360 722, G11B 509, G11B 1518, G11B 1700, G11B 1902
Patent
active
053880137
ABSTRACT:
A record storage format conversion method and a system which is capable of mitigating a load imposed on the memory by decreasing the number of accesses to the memory for finding out a CKD record of concern upon format conversion of the CKD records into FBA records while allowing the capacity of a memory required for holding the track data to be decreased. All gaps inclusive of inter-record gaps and inter-field gaps are deleted from variable length records of one track recorded in a variable length format employed in an external storage device of a general-purpose computer. The track data thus obtained is divided into management units each of a predetermined size corresponding to an integral multiple of the size of the fixed length block of the fixed length record. Position information indicating the positions of all the variable length records included in the management unit as well as position information indicating relative positions of the variable length records from the start of the track in the variable length format are written, whereon the management unit is divided into fixed length record blocks each having a predetermined fixed block size for storage thereof. Each CKD record holds information indicating the relative position thereof from the start of the track of the CKD format.
REFERENCES:
patent: 5034914 (1991-07-01), Osterlund
patent: 5200864 (1993-04-01), Dunn et al.
Forbus Jr. T. N.
Hajec Donald
Mitsubishi Denki & Kabushiki Kaisha
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