Patent ID: 6611404
Filing Date: 2003-08-26
Classification: G11B

Abstract:
A disk apparatus comprising:a frame; disk rotating means for supportably rotating a disk; a head writing data to and reading data from the rotating disk; a head carriage radially moving said head relative to the rotating disk; a first voice coil motor, having a first magnetic circuit structure and a first drive coil which is fixed on a first side of said head carriage, moving said head carriage; and a second voice coil motor, having a second magnetic circuit structure and a second drive coil which is fixed on a second side of said head carriage, moving said head carriage, wherein said first drive coil and said second drive coil generate different propulsive forces that depend on different loads arising on the first side and the second side of said head carriage when said head carriage is moved, and wherein said first voice coil motor and said second voice coil motor are configured so that a number of turns in said first drive coil and a number of turns in said second drive coil differ so as to generate different respective propulsive forces corresponding to unequal loads on said first side and said second side of said head carriage.