Patent ID: 6229677
Filing Date: 2001-05-08
Classification: G11B

Abstract:
A set of vertically aligned actuator arms in a stack arrangement for a disc drive system having at least two discs, the set comprising:at least two inner actuator arms positioned between the two discs, each inner actuator arm including:an inner arm head gimbal assembly; andan inner arm mounting support having a first end and a second end, the second end coupled to the disc drive system and the first end coupled to the inner arm head gimbal assembly;at least one outer actuator arm not positioned between the two discs, wherein each said actuator arm is installed at a z-height, wherein the z-height is the distance from a plane defined by a surface of a mounting support for each respective actuator arm to a plane of a memory disc surface wherein the z-height of the at least one outer actuator arm is constant along the entire plane of the surface of the mounting support between the plane of the surface of the mounting support and the plane of the memory disc when the disc is at rest, and each said outer actuator arm includes:an outer arm head gimbal assembly;an outer arm mounting support having a first opposing end and a second opposing end, the second opposing end coupled to the disc drive system and the first opposing end coupled to the outer arm head gimbal assembly,wherein the z-height of the at least one outer actuator arm is selected by calculating the z-height for the outer actuator arm wherein a gram load applied to said outer arm head gimbal assembly is equal to a gram load on at least one of said inner arm head gimbal assemblies coupled to said first ends of said inner arm mounting supports of said inner actuator arms; andwherein the z-height of said outer actuator arm is less than the z-height of each said inner actuator arm to match said gram loads.