Disk having stress relieving zones for use with a disk clamping device in a hard disk drive
 A disk and a disk clamp device in a hard disk drive are disclosed. The disk of this invention has a stress and strain relief section, which effectively intercepts the spread of clamping torque-caused stress and strain energy from the clamped zone to the magnetic head landing zone of the disk when the disk is clamped to a spindle motor of the hard disk drive with a clamp being screwed to the hub of the spindle motor using a plurality of screws. The stress and strain relief section thus almost completely reduces strain in the landing zone and protects the landing zone from bending or distortion. The stress and strain relief section may be a plurality of concentric arcuate apertures which are regularly formed on a concentric circle at a position just outside a disk clamping portion of the clamp. Alternatively, the stress and strain relief section may be an annular groove which is concentrically formed on each side of the disk at a position between the clamped zone and the magnetic head landing zone. 
SamSung Electronics Co., Ltd.
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Woo-Cheol Seung-Young
Jeong Yi