Patent ID: 7499244
Filing Date: 2009-03-03
Classification: G11B

Abstract:
1. A disk holder installed at a driving motor of an off-line servo-track writer, the disk holder comprising: a flange supporting a plurality of disks; a mounting portion provided at one side of the flange and joined to the driving motor; a hub provided at the other side of the flange and having a space into which air flows, the plurality of disks and a plurality of spacers for maintaining a gap between the plurality of disks being assembled around an outer circumference of the hub; a plurality of pressing members installed on the hub to be able to move back and forth in a radial direction of the hub by the pressure of air flowing into the hub, thereby being projected out of an outer circumferential surface of the hub and pressing inner circumferential surfaces of the plurality of disks and the plurality of spacers; and a clamp joined to one end portion of the hub and fixing the plurality of disks and the plurality of spacers, wherein each of the plurality of pressing members presses the inner circumferential surface of all of the plurality of disks simultaneously.