Dynamic magnetic information storage or retrieval – General recording or reproducing – Thermomagnetic recording or transducers
Reexamination Certificate
2001-08-03
2010-06-15
Mercedes, Dismery E (Department: 2627)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Thermomagnetic recording or transducers
C360S025000, C360S031000, C360S053000
Reexamination Certificate
active
07738206
ABSTRACT:
A method and apparatus for providing an early warning of thermal decay in magnetic storage media are provided. In accordance with an embodiment of the present invention, a test pattern that is particularly susceptible to thermal decay is written to a disk. The test pattern is then read, and the amplitude of the signal produced by the test pattern is stored. When testing for thermal decay is desired, the test pattern is again read, and the amplitude of the signal produced in the channel is compared to the stored amplitude. If the later amplitude is less than the stored amplitude by at least a predetermined amount, a thermal decay warning signal is generated. In accordance with another embodiment of the present invention, a test pattern is written to a portion of a disk that has been identified as being particularly susceptible to thermal decay. The amplitude produced by the test pattern is then stored so that it can later be compared to an observed amplitude when testing for thermal decay. The present invention allows remedial measures to ensure the integrity of data to be taken before data loss due to thermal decay can occur.
REFERENCES:
patent: 5810477 (1998-09-01), Abraham et al.
patent: 6084729 (2000-07-01), Ito
patent: 6088176 (2000-07-01), Smith et al.
patent: 6091559 (2000-07-01), Emo et al.
patent: 6147827 (2000-11-01), Southerland et al.
patent: 6347016 (2002-02-01), Ishida et al.
patent: 6373647 (2002-04-01), Baker
patent: 6429984 (2002-08-01), Alex
patent: 6445525 (2002-09-01), Young
patent: 6490111 (2002-12-01), Sacks
patent: 6525891 (2003-02-01), Tsunoda
patent: 6611389 (2003-08-01), Liu et al.
patent: 6633442 (2003-10-01), Quak et al.
patent: 6697203 (2004-02-01), Cheng et al.
patent: 6987630 (2006-01-01), Higgins et al.
patent: 7173783 (2007-02-01), McEwen et al.
patent: 7209304 (2007-04-01), Seng et al.
“A Fast, Accurate, and Reproducible In-Drive Measurement of Media Thermal Decay”, by B. Higgins and B. Scardt, IEEE Transactions on Magnetics, vol. 40, No. 1, Jan. 2004.
“Thermal Decay in High Density Disk Media”, by Y. Zhang and H. Bertrand, IEEE Transactions on Magnetics, vol. 34, No. 5, Sep. 1998.
“Experimental Study of Thermal Decay in High-Density Magnetic Recording Media”, by Y. Hosoeet al., IEEE Transactions on Magnetics, vol. 33, No. 5, Sep. 1997.
“High Density Magnetic Recording Media Design and Identification: Susceptibility to Termal Decay”, by P. Lu and S. Charap, IEEE Transactions on Magnetics, vol. 31, No. 6, Nov. 1995.
Toigo, Jon William, “Avoiding a Data Crunch”,Scientific American, pp. 59-74, May 2000, U.S.A.
McCarthy, et al., U.S. Appl. No. 09/767,894 Entitled “High Efficiency, Error Minimizing Coding Strategy Method and Apparatus” filed Jan. 22, 2001.
Chew Xiaokun
Guarisco Davidc
Lin G. Herbert
Mercedes Dismery E
Seagate Technology LLC
Westman Champlin & Kelly P.A.
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