Patent ID: 6504683
Filing Date: 2003-01-07
Classification: G11B

Abstract:
A magnetic disk apparatus comprising:a head slider on which a magnetic head is mounted; a disk on which information is recorded/regenerated by said magnetic head; a spindle motor, integrally structured with said disk, for rotating said disk; a suspension for elastically supporting said magnetic head slider; a carriage arm for supporting said suspension and positioning said magnetic head; and a base plate for attaching said spindle motor and said carriage arm thereon, respectively, wherein an out-of-plane primary natural frequency of a part of said base plate to which said spindle motor is to be attached is set to be the same as an out-of-plane primary natural frequency of a part of said base plate to which said carriage arm is to be attached, an out-of-plane primary natural frequency of said carriage arm is detached from the out-of-plane primary natural frequency of the base plate part to which said carriage arm is to be attached to such an extent that no resonance occurs, and an out-of-plane primary natural frequency of said disk is detached from the out-of-plane primary natural frequency of the base plate part to which said disk is to be attached to such an extent that no resonance occurs.