Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Reexamination Certificate
2006-01-17
2006-01-17
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
C360S025000
Reexamination Certificate
active
06987630
ABSTRACT:
A method and apparatus is provided for measuring a media thermal decay rate for a disk in a disk drive. In one embodiment, reference patterns are written in a plurality of reference sectors on a test track of a disk surface. A thermal decay measurement duration is predetermined. After at least two decades of time longer than the predetermined thermal decay measurement duration have passed since writing the reference patterns in the plurality of reference sectors, sector-under-test patterns are written in a plurality of sectors-under-test, wherein the sectors-under-test and the reference sectors are written in data sectors and alternate with one another about at least a portion of the test track. The mean square error is measured and averaged for the reference sectors, and the mean square error is measured and averaged for the sectors under test. The averaged mean square error for the reference sectors and the averaged mean square error for the sectors-under-test are used to calculate the media thermal decay rate. In another embodiment, information associated with the amplitude of the readback signal is used instead of, or in addition to, the mean square error of the readback signal to calculate the media thermal decay rate.
REFERENCES:
patent: 5923485 (1999-07-01), Ito
patent: 6147488 (2000-11-01), Bamba et al.
patent: 6429984 (2002-08-01), Alex
patent: 2003/0067697 (2003-04-01), Weinstein et al.
Dhagat, P. et al.; “sub-millisecond Spin-stand Measurements of Thermal Decay in Magnetic Recordings”; Submitted IEEE Trans. Magn., Mar. 5, 1999.
Toigo, “Avoiding a Data Crunch,”Scientific American, May 2000, pp. 57, 59-61, 64-67 and 70-74.
U.S. Appl. No. 09/791,056, filed Feb. 21, 2001, Cross.
U.S. Appl. No. 09/879,289, filed Jun. 11, 2001, Himle et al.
Higgins Bill
Schardt Bruce
Hansra Tejpal S.
Hudspeth David
Maxtor Corporation
Negron Daniel L.
LandOfFree
Method and apparatus for media thermal decay measurement in... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for media thermal decay measurement in..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for media thermal decay measurement in... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3580692