Patent ID: 7636222

Claim:
A disk drive comprising: a drive housing; a storage disk that is rotatably secured to the drive housing, the storage disk having a data surface with a data track; a head suspension assembly including a data transducer; an actuator assembly; and an E-block that is moved by the actuator assembly, the E-block including (i) a first actuator arm that supports the head suspension assembly over the data track, the first actuator arm having a first upper surface that moves in a direction substantially parallel to the data surface, the first upper surface having a first configuration, the first actuator arm having a first thickness that is measured in a direction that is substantially perpendicular to the first upper surface, and (ii) a second actuator arm that does not support any head suspension assemblies, the second actuator arm having a second upper surface that moves in a direction substantially parallel to the data surface, the second actuator arm having a second thickness that is measured in a direction that is substantially perpendicular to the second upper surface, the second thickness being substantially similar to the first thickness, the second upper surface having a second configuration that is different than the first configuration to decrease off-track displacement of the data transducer, wherein the second actuator arm includes a damping material that is positioned over at least a portion of the second upper surface.