Patent ID: 7468861
Filing Date: 2008-12-23
Classification: G11B

Abstract:
1. A magnetic disk apparatus comprising: a disk-shaped rotary magnetic disk; a magnetic head that records information on said magnetic disk or plays back information from said magnetic disk; a magnetic head support mechanism that supports said magnetic head; a positioning mechanism that moves said magnetic head in a radial direction of said magnetic disk to place the head in position; an enclosure having a base and a cover made of a nonmagnetic material; and a shield member made of a magnetic material to magnetically shield said magnetic head; wherein the enclosure incorporates therein said magnetic disk, said magnetic head, said magnetic head support mechanism, said positioning mechanism, and said shield member; and wherein said shield member has an upper shield located above said magnetic head and extending over a range in which said magnetic head moves, a lower shield located on a side opposite to a plane in which said magnetic head exists and extending over the range in which said magnetic head moves, and a connecting portion connecting an outer side end portion of said upper shield and an outer side end portion of said lower shield near outer fringes of said magnetic disk.