Importance

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Abstract

The feature of the present invention lies in the point that a flying height variation of a head is checked by use of a read signal sent from the head so as to easily detect the flying height out of an allowable range, so that the generation of an abnormal data writing/reading operation is prevented in advance with result that data writing/reading operation can be surely realized in an interior of a HDD. There is provided a system in which a read signal obtained when data recorded in a disk 1 is read by a head 2 is input, and the flying height variation of the head is checked by use of a DC voltage of a gain control signal of an AGC circuit of a data reading processing circuit for executing a predetermined data reading processing. A CPU 11 converts a DC voltage level of the gain control signal of the AGC circuit to digital data by an A/D converter so as to check the flying height variation of the head. The CPU 11 compares the level value of the input gain control signal with threshold data DT stored in a memory. When the compared value exceeds the allowable range, the CPU 11 outputs a detection signal FS of the flying height variation for designating that an amount of the flying height of the head is abnormally varied.

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First Claim