Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data in specific format
Patent
1982-04-06
1984-02-14
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data in specific format
360 39, G11B 509
Patent
active
044320256
ABSTRACT:
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 f1, providing optimum track capacity 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.
REFERENCES:
patent: 3829837 (1974-08-01), Farr, Jr.
patent: 4231071 (1980-10-01), Anderson
"Disc File Memories" by H. J. McLaughlin, Instruments & Control Systems, Nov. 1961, vol. 64, pp. 2064-2068.
Canney Vincent P.
Cummins R. E.
International Business Machines - Corporation
LandOfFree
System and method for formatting pairs of concentric magnetic tr does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System and method for formatting pairs of concentric magnetic tr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for formatting pairs of concentric magnetic tr will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2377939