Patent ID: 6645648
Filing Date: 2003-11-11
Classification: G11B

Abstract:
A magnetic recording medium comprising a nonmagnetic lower layer and a magnetic layer provided in this order on a support wherein said magnetic layer comprises a ferromagnetic metal powder or a ferromagnetic hexagonal ferrite powder and a binder and has a coercive force equal to or higher than 143 kA/m,wherein said magnetic recording medium is a medium for recording signals having a surface recording density ranging from 0.2 to 2 Gbit/inch2, said support has a thickness equal to or less than 5.5 &mgr;m and a Young's modulus in the MD direction equal to or higher than 11,000 Mpa, and said support has on the reverse surface from said magnetic layer a backcoat layer, said backcoat layer having not fewer than 200 and not more than 1,000 protrusions having a height equal to or higher than 50 nm per 10,000 &mgr;m2.