Patent ID: 8270119
Filing Date: 2012-09-18
Classification: G11B

Abstract:
1. A disk drive comprising: a storage disk; an actuator arm assembly including a transducer element using which data is read from and written to the storage disk; and a voice coil motor for positioning the actuator arm assembly, the voice coil motor including a ferromagnetic plate on which at least one magnet is mounted, the ferromagnetic plate having a coined section that: (i) has substantially the same thickness as other parts of the ferromagnetic plate, (ii) projects away from said at least one magnet, and (iii) is positioned near a neutral zone of said at least one magnet, wherein the coined section has walls that are shaped to impede the magnetic flux flow in a direction that is perpendicular to the magnetic flux flow and extend in a direction that is substantially parallel to the magnetic flux flow.