annular patterns of concentric data tracks not shown on the magnetic disk 112 at least one slider 113 is positioned near the magnetic disk 112 each slider 113 supporting one or more magnetic head assemblies 121 as the magnetic disk rotates slider 113 moves radially in and out over the disk surface 122 so that the magnetic head assembly 121 may access different tracks of the magnetic disk where desired data are written each slider 113 is attached to an actuator arm 119 by way of a suspension 115 the suspension 115 provides a slight spring force which biases slider 113 against the disk surface 122 each actuator arm 119 is attached to an actuator means 127 the actuator means 127 as shown in fig1 may be a voice coil motor vcm the vcm comprises a coil movable within a fixed magnetic field the direction and speed of the coil movements being controlled by the motor current signals supplied by controller 129 during operation of the disk storage system the rotation of the magnetic disk 112 generates an air bearing between the slider 113 and the disk surface 122 which exerts an upward force or lift on the slider the air bearing thus counter balances the slight spring force of suspension 115 and supports slider 113 off and slightly above the disk surface by.