Read/write head buffer

Details Read/write head buffer Read/write head buffer

1989-01-31

1992-10-13

Shaw, Gareth D.

Dynamic magnetic information storage or retrieval

Head

Core

360 64, 360 722, G06F 13362

Patent

active

051558114

ABSTRACT:
The read/write head buffer provides a buffer memory for each read/write head in the rotating media data storage system to that a seek request from the processor can be handled as soon as the beginning of the requested data record is positioned below the associated read/write head. The data image stored on the rotating media is read from the rotating media by the read/write head and stored in the read/write head buffer independent of the availability of a data communication path to the processor. Thus, the read data operation need not be synchronized with the availability of a data communication path to the processor and the requested data is retrieved from the rotating media as soon as the data record is properly positioned. In no case is the data retrieval time greater than one revolution of the rotating media. The error correction codes written on the rotating media to protect the integrity of the requested data are maintained since they are stored in the read/write head buffer along with the data record. Thus, once a data communication path is established to the processor, the control module receives the track data image from the read/write head buffer and can deformat this data from the bit serial, run length limited coding with error correction characters format of this data and convert this information to eight bit parallel data that is in an input/output record format for use by the control unit.

REFERENCES:
patent: 3831191 (1974-08-01), Gold
patent: 4688106 (1987-08-01), Keller et al.
patent: 4882671 (1989-11-01), Graham et al.
patent: 4918651 (1990-04-01), Bonke et al.
patent: 4974199 (1990-11-01), Verbanets, Jr. et al.

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