| 摘要 |
According to the present invention, there is provided a magnetic disk apparatus comprising a reading/writing circuit for detecting first to fourth burst signals corresponding to first to fourth burst data items recorded on a recording medium in order to position a head, a CPU for calculating a first value expressed by ((first burst signal)-(second burst signal))/((first burst signal)+(second burst signal)) and a second value expressed by ((third burst signal)-(fourth burst signal))/((third burst signal)+(fourth burst signal)) from the amplitudes of the first to fourth burst signals detected by the reading/writing circuit to move the head to a position at which the obtained first value and the obtained second value coincide with each other, a ROM for storing a reference value with which abnormality of the head is determined and a CPU for determining whether or not the difference between the absolute value of the first value when the head has been moved to the position at which the first value and the second value coincide with each other and the reference value stored in the ROM is larger than a predetermined value to detect abnormality of the head in a case where a determination has been performed that the difference between the absolute value of the first value and the reference value is larger than the predetermined value.
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