Fly height extraction system
First Claim
1. A system for monitoring fly height between a magnetic recording medium and a transducing head, comprising:
- a signal analyzer and a data processor;
said signal analyzer generating signal amplitude values of frequency components within multi-frequency signals sensed on the recording medium;
said data processor using said signal amplitude values to calculate a magnetic spacing change value relative to the recording medium and the transducing head; and
said data processor adjusting said magnetic spacing change value as necessary to reflect transducing head wear.
1 Assignment
0 Petitions
Accused Products
Abstract
A system and method for monitoring fly height between a magnetic recording medium and a transducing head. In a first exemplary embodiment, magnetic spacing change value is calculated using media noise on the recording medium (instead of prerecorded tones) to provide a broadband frequency distribution that results in improved Wallace equation accuracy. In a second exemplary embodiment, a magnetic spacing change value is acquired by any suitable method but is adjusted as necessary to reflect transducing head wear, thus providing a methodology for calculating changes in fly height by taking into account the signal loss that is attributable to wear. In this way, a basic understanding of the mechanism causing changes in magnetic spacing is achieved.
36 Citations
19 Claims
-
1. A system for monitoring fly height between a magnetic recording medium and a transducing head, comprising:
-
a signal analyzer and a data processor; said signal analyzer generating signal amplitude values of frequency components within multi-frequency signals sensed on the recording medium; said data processor using said signal amplitude values to calculate a magnetic spacing change value relative to the recording medium and the transducing head; and said data processor adjusting said magnetic spacing change value as necessary to reflect transducing head wear. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A system for monitoring fly height between a magnetic recording medium and a transducing head, comprising:
-
a signal analyzer and a data processor; said signal analyzer generating signal amplitude values of frequency components within media noise sensed on the recording medium; and said data processor calculating a magnetic spacing change value from said signal amplitude values, and adjusting said magnetic spacing change value as necessary to reflect transducing head wear. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
-
Specification