Method of controlling disk control unit

Details Method of controlling disk control unit Method of controlling disk control unit

1994-09-08

1998-03-03

Harvey, Jack B.

395457, 395428, 395821, G11B 509

Patent

active

057245428

ABSTRACT:
An ID portion indicating the corresponding relationship between the number of a record contained in an FBA block and the position of the record is provided at the beginning of the FBA block. When a seek command has been issued by a host apparatus in the CKD format, a device adapter obtains the FBA block number corresponding to the parameter value (CCHH) of a head positioning command and positions a head at the FBA block of this number. Next, the device adapter obtains the FBA block number corresponding to the parameter value (sector value) of a set-sector command, reads one CKD track of blocks from the FBA block designated by the FBA block number and develops these blocks in a cache memory. A channel adapter searches the cache memory for a commanded record by referring to the information in the ID portion.

REFERENCES:
patent: 5204963 (1993-04-01), Noya et al.
patent: 5388013 (1995-02-01), Nakamura

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