Abstract: 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.

Abstract: A method and apparatus are provided for storing and retrieving data in a non-volatile manner. The data is stored in a magnetic cell having a magnetic moment with a direction. A conductor is positioned near the cell and carries a current formed by a current driver. A data detector detects a value for data stored in the cell based on a level of current driven through the conductor.

Abstract: A method and apparatus are provided for storing and retrieving data in a non-volatile manner. The data is stored in a magnetic cell having a magnetic moment with a direction. A conductor is positioned near the cell and carries a current formed by a current driver. A data detector detects a value for data stored in the cell based on a level of current driven through the conductor.

Abstract: 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.