Patent ID: 7773339

Claim:
A hard disk drive( 10 ) comprising: a disk base( 14 ); a disk pack( 8 ) mounted to said disk base, comprising a spindle motor( 270 ); a disk( 12 ) coupled between a disk clamp( 300 ) and said spindle motor by N screws(SL) through N screw holes(S) proceeding from a first clamping surface( 322 ) to a second clamping surface( 324 ), with said disk clamp including: a disk clamp base( 320 ) and a disk clamp platform( 330 ); wherein said disk clamp base( 320 ) includes: i) said N of first screw holes proceeding from said first clamping surface for contacting a disk surface( 120 - 1 ) on said disk to a second clamping surface for contacting said disk clamp platform, and ii) an upstanding abutment( 320 - 1 ) which forms a cavity in an upper surface of said disk clamp base for positioning said disk clamp platform; wherein said disk clamp platform( 330 ) includes: said N of second screw holes(S) proceeding from a first clamp platform surface for contacting said second clamping surface( 332 ) to a second platform surface( 334 ) for contacting said N of screws; and wherein said N is at least four.