Ultrasonic Excitation of a Magnetic Recording Disk for Reduction of Stiction at the Head/Disk Interface
Original Publication Date: 1985-Mar-01
Included in the Prior Art Database: 2005-Feb-18
A method is disclosed for reducing the stiction forces between the read/write head and the disk surface at the start-up of a rotating magnetic recording disk file by ultrasonically exciting the disk. The disk surface (or the shaft supporting the disk) is ultrasonically excited at suitable power and low frequency to overcome the stiction between the head/disk interface just prior to start-up of the disk file. The low power, low amplitude ultrasonic excitation of the disk provides a substantial decrease in the coefficient of static friction between the head and the disk, so that the head can be freed from the disk at start-up and "fly" above the disk when the disk is rotating at operating speed.