Patent ID: 6673477
Filing Date: 2004-01-06
Classification: G11B,Y10T

Abstract:
A floppy disk-shaped magnetic recording medium, which comprises:a non-magnetic support having projections on the surface thereof; a substantially non-magnetic lower layer including carbon black in an amount of less than 40 weight % of the substantially non-magnetic lower layer; and a magnetic layer containing a ferromagnetic powder dispersed in a binder, in this order, wherein: the non-magnetic lower layer and the magnetic layer are provided on each side of the non-magnetic support, the magnetic recording medium is configured and arranged for use under a condition that a velocity of the magnetic recording medium relative to a magnetic head is at least 14 m/sec and data can be read from the magnetic recording medium, and the non-magnetic lower layer has a thickness from five to twenty times as great as a maximum height of the projections on the surface of the non-magnetic support.