Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Reexamination Certificate
2006-10-02
2010-12-21
Negrón, Daniell L (Department: 2627)
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
C360S075000
Reexamination Certificate
active
07855848
ABSTRACT:
Detection of head disk interference is provided by monitoring a hard disk drive characteristic related to disk rotation rate. A number of characteristics can indicate HDI. These include the magnitude of decreases in rotation rate, changes in the time-derivative (time-rates of change) of rotation rate or other changes in time-profiles of rotation rate, changes in spin motor current, differences between maximum and minimum values of spin motor current, changes in the time-derivative (time-rates of change) of spin motor current or other changes in time-profiles of spin motor current or combinations or indicators thereof. These approaches to detecting HDI provide several potential advantages. Detection of HDI can be achieved relatively early in a test or other procedure, can be performed relatively rapidly, can distinguish HDI from at least some other anomalies and can indicate the location and/or magnitude of HDI occurrences.
REFERENCES:
patent: 5539592 (1996-07-01), Banks et al.
patent: 5570247 (1996-10-01), Brown et al.
patent: 7095578 (2006-08-01), Ma
Boon Lee Teng
Kiong Tan Chin
LeSage Richard
Nguyen Duong Hong
Lucente David K.
Negrón Daniell L
Seagate Technology LLC
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