Adaptive and in-situ load/unload damage estimation and compensat

Details Adaptive and in-situ load/unload damage estimation and compensat Adaptive and in-situ load/unload damage estimation and compensat

1995-06-06

1997-05-27

Kim, W. C.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

371 51, G11B 509, G06F 1100

Patent

active

056337671

ABSTRACT:
The present invention overcomes the problems that accompany the use of ramps to load and unload transducer carrying sliders in rigid magnetic disk data storage devices. The tracks in the region where the slider loads and unloads are read and the errors recorded following each slider loading operation. One technique is to track the error increase and identify imminent device failure when the rate of error increase during a given number of the most recent slider load cycles exceeds a threshold value. In another mode, a dedicated sequence of tracks is recorded at an increased linear density to assure that read errors occur to enable a more effective comparative evaluation. This makes possible a two stage evaluation, a first threshold number of errors indicative of degrading performance which initiates lower actuator velocity to inhibit further degradation and a second threshold error quantity that indicates imminent catastrophic failure and triggers a warning to the system user. To make the analysis more meaningful, certain errors may be ignored, such as simpler errors or the full number of errors in a cluster that may be the result of a single event.

REFERENCES:
patent: 3704363 (1972-11-01), Salmassy et al.
patent: 4516162 (1985-05-01), West
patent: 4731680 (1988-03-01), Moriyama et al.
patent: 4769804 (1988-09-01), Satoh et al.
patent: 4969139 (1990-11-01), Azumatani et al.
patent: 5034939 (1991-07-01), Kurz et al.
patent: 5068754 (1991-11-01), Garde
patent: 5121263 (1992-06-01), Kerwin et al.
patent: 5218590 (1993-06-01), Miyasaka
patent: 5227212 (1993-07-01), Ahlert et al.
patent: 5351156 (1994-09-01), Gregory et al.
patent: 5513160 (1996-04-01), Satoh et al.

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