System for retrieval of a data record by buffering the record in

Details System for retrieval of a data record by buffering the record in System for retrieval of a data record by buffering the record in

1991-10-23

1994-07-12

Lee, Thomas C.

Boots, shoes, and leggings

3642362, 3642386, 3642391, 364DIG1, G06F 1314

Patent

active

053296222

ABSTRACT:
The multiple step data read apparatus provides a buffer memory (108-0) for each read/write head (110-0) in the rotating media (111-0) data storage system that can store up to the entire track (400) of data that includes the requested data (Sectors 2-6). The data is fragmented such that the data transferred into the read/write head buffer first is transmitted to the control unit first whether or not that data is at the beginning of the data requested by the control unit. The data is further fragmented such that critical portions of the data are available to the control unit to satisfy the host request as soon as the data is read from the device. This fragmenting results in the data becoming available to the control unit in the minimum time possible and the performance of the subsystem being the maximum possible. In addition each data fragment transfer to the control unit (104) is initiated a predetermined time before the end of the fragment of data such that the read/write head (110-0) reaches the end of the fragment the same time that the last sector of the fragment is transmitted to the control unit (104).

REFERENCES:
patent: 4723223 (1988-02-01), Hanada
patent: 4918651 (1990-04-01), Bonke
patent: 5155811 (1992-10-01), Dean

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