G - Physics – 11 – B
Patent
G - Physics
11
B
352/12
G11B 5/012 (2006.01) G11B 5/09 (2006.01) G11B 20/12 (2006.01)
Patent
CA 1173956
SA980045X SYSTEM AND METHOD FOR FORMATTING PAIRS OF CONCENTRIC MAGNETIC TRACKS OF DIFFERENT CAPACITY TO A PLURALITY OF EQUAL CAPACITY LOGICAL TRACKS Abstract of the Disclosure A method and system are disclosed for storing data on a magnetic disk file to increase the overall storage capacity of the file without complicating the data management functions and aspects of the connected data processing system. The system involves a magnetic disk having concentric recording tracks where a first inner group of tracks are recorded at one frequency fl, providing optimum track capcity X for these tracks, and a second outer group of tracks are recorded at a second frequency f2, which also provides optimum track capacity for these tracks. At each address position, a pair of magnetic transducers are associated with a different track from each group During the writing or reading of serial by byte data, the pair of tracks are transduced on successive revolutions. Suitable switching circuitry for switching from one transducer to the other in response to sensing "index" is provided and also for changing the clock frequency. The system further includes suitable disk formatting circuitry for converting the two physical tracks into one (or more) logical tracks having the same byte capacity. The method is characterized by the steps of switching at index from one transducer to the other and adjusting the clock frequency accordingly so all logical records have the same capacity. The magnetic disk may be divided into more than two groups of tracks, if desired.
403711
International Business Machines Corporation
Kerr Alexander
LandOfFree
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