| 摘要 |
A system for measuring fly height of a head over a rotatable magnetic disc having a disc surface on which data is digitally stored is provided. Data is digitally stored on the disc surface by selectively polarizing portions of the disc surface into at least a first magnetic state or a second magnetic state. A read back circuit is coupled to the head. The read back circuit generates an electrical read back signal in response to the head encountering a transition between magnetic states. The system for measuring fly height includes a measurement circuit coupled to the head read back circuit to measure pulse width and amplitude of the read back signal. A calculation circuit coupled to the measurement circuit determines the fly height of the head based on the measured pulse width and amplitude of the read back signal. In addition, a method of measuring the fly height of a head by using a read back signal in a disc drive storage system is provided.
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