A tolerance ring configured to improve mass eccentricity of an actuator arm assembly. The tolerance ring has a cylinder with a predetermined length between two ends, with a gap along the predetermined length of the cylinder, the gap having a first and a second edge, the cylinder having an aperture in the surface of the cylinder at the second edge.

 
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< Disk drive determining operating fly height by detecting head disk contact from disk rotation time

> Hard disk drive apparatus, method to control flying on demand of hard disk drive apparatus using thermal asperity signal, and recording media for computer program thereof

> Thin-film magnetic head, head gimbal assembly, head arm assembly and magnetic disk drive
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