Patent ID: 7256961
Filing Date: 2007-08-14
Classification: G11B

Abstract:
1. A disk pack for use in a hard disk drive, comprising: a spindle motor comprising a principal axis and a dampened spindle motor flange, further comprising a disk face including a shallow groove symmetrically arranged about said principal axis; wherein said shallow groove includes a first rim joined to a trough joined to a second rim; wherein said first rim is closer to said principal axis than said trough and said trough is closer to said principal axis than said second rim; wherein said trough has a depth of at least 0.5 millimeters (mm); and wherein said disk pack, further comprises: a metallic ring included at least one layer of a visco-elastic material composed primarily of a partially viscous elastomer deposited on said metallic ring; and said spindle motor coupling said shallow groove filled with said layer of said visco-elastic material through compression of said visco-elastic material, in said trough, by said metallic ring to a disk; wherein said layer of said visco-elastic material has a thickness of at least 0.05 mm more than said trough before said compression.