Detection of Magnetic Disk Asperities by Differential Pressure Sensing on a Slider Air-Bearing Surface
Original Publication Date: 1989-Sep-01
Included in the Prior Art Database: 2005-Jan-31
Asperities on magnetic recording disks which pass beneath the air-bearing rails of a slider create pressure perturbations. This is due to a changing spacing condition for the air-bearing. The magnitude of a pressure perturbation depends primarily on the asperity size and shape, slider flying height, and the disk velocity. If the magnitude of the perturbation is large enough, an asperity can be detected by using pressure transducers on the air-bearing rails. This method of asperity detection does not require head-to-disk asperity contact.