Excavating
Patent
1986-12-04
1988-03-22
Fleming, Michael R.
Excavating
371 39, G06F 1112
Patent
active
047333960
ABSTRACT:
An apparatus for detecting and correcting errors which occur when transferring data between a magnetic disk and the main memory of a magnetic disk system. Error detection apparatus determines the corrections of sectors of data as the sectors are transferred from a magnetic disk to main memory. A main controller is notified by the error detection apparatus as to which sectors of data have been transferred incorrectly, and are therefore in need of correction. At the request of the main controller, the sectors in need of correction, i.e., the sectors in error, are transferred from main memory to the main controller which has error correction apparatus. The main controller corrects the sectors in error and then returns the sectors in error to main memory. The main controller receives sectors in error from main memory, and transfers corrected sectors of data back to main memory only during free times when data is not being transferred between the main memory and a magnetic disk.
REFERENCES:
patent: 4454595 (1984-06-01), Cage
patent: 4562577 (1985-12-01), Glover
patent: 4564945 (1986-01-01), Glover
patent: 4567594 (1986-01-01), Deodhar
patent: 4590559 (1986-05-01), Baldwin et al.
patent: 4604748 (1986-08-01), Sato
Baldwin David R.
Sata Shingo
Fleming Michael R.
Kabushiki Kaisha Toshiba
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