Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1996-04-19
1998-08-11
Sniezek, Andrew L.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360128, 360137, 360 7804, G11B 1548
Patent
active
057935530
ABSTRACT:
The invention increases the reliability of a data storage device. The data storage devices contain a memory element disk, containing data, the memory element disk being rotatably mounted about an axis, a transducer head, an actuator for moving the transducer head relative to the disk, and a counter for counting the number of seek operations performed by the transducer head. The invention may include setting a threshold seek value T.sub.seek and comparing this value to the actual seek performed by the head, V.sub.seek, to determine the need for a stop/start operation. Alternatively, the invention includes defining threshold seek operation count T.sub.seek, counting the number of seek operations to determine M.sub.seek since the last stop/start operation, recalling the total number of seek operations completed by the data storage device to define N.sub.seek, defining D.sub.seek by determining the difference between N.sub.seek and M.sub.seek, and determining whether D.sub.seek is equal to or greater than T.sub.seek. When D.sub.seek is equal to or greater than T.sub.seek, the transducer head undergoes a stop/start operation. M.sub.seek may then be reset to equal N.sub.seek before the stop/start operation is undertaken. When D.sub.seek is less than T.sub.seek the count is commenced. The invention may also be used with devices that additionally have auxiliary memory and with arrays of data storage devices.
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IBM Technical Disclosure Bulletin, vol. 26, No. 2, Jul. 1983, regarding: Magnetic Head On-Line Cleaning, authors: F. Ertingshausen, H. Hinkel and H.G. Nauth.
Bussan Matthew J.
Gresens John J.
International Business Machines - Corporation
Sniezek Andrew L.
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