Touchdown detection in magnetic disk storage devices

摘要

Touchdown detection in magnetic storage devices is provided to detect contact between a storage medium and a magnetic head having an embedded contact sensor. A sample stream is obtained, which includes samples of a sensor signal output from the embedded contact sensor. The sample stream is segmented into multiple segments. A modulation depth is determined for each of the segments. A combined modulation depth is determined by combining the modulation depths of the segments using a weighting function. The combined modulation depth is compared with a threshold. A determination is made as to whether the magnetic head makes contact with the storage medium based on a result of the comparing.

主权项

1. A method to detect contact between a storage medium and a magnetic head having an embedded contact sensor, the method comprising:
obtaining a sample stream comprising samples of a sensor signal output from the embedded contact sensor; segmenting the sample stream into a plurality of segments; determining a modulation depth for each of the segments; determining a combined modulation depth by combining the modulation depths of the segments using a weighting function; comparing the combined modulation depth with a threshold; and determining if the magnetic head makes contact with the storage medium based on a result of the comparing.