Patent ID: 7144643

Claim:
A magnetic recording medium used for a magnetic recording system having an MR head as a regeneration head, the recording medium comprising at least a nonmagnetic layer and magnetic layer sequentially laminated on one face of a nonmagnetic supporting member, the magnetic layer comprising at least a ferromagnetic powder, a binder resin and an abrasive, wherein the magnetic recording medium has a grinding ability such that when the magnetic recording medium is supported with a tension of 8.8 ×10 −1 N/cm per unit width between two guide rolls disposed with a center-to-center distance of 45 mm, and an edge in the longitudinal direction of a rectangular column of a Fe-Si-Al alloy sendust bar having a square cross section pushes a magnetic layer forming face of the magnetic recording medium at a middle point between the guide rolls in a direction perpendicular to a running direction of the magnetic recording medium with a displacement of 2 mm, then the width of a face at the edge of the sendust bar, formed by abrasion of the sendust bar in the running direction of the recording medium after 200 times of reciprocating movement at a running speed of 2.5 m/s with a total running length of the magnetic recording medium of 250 m, is in a range of from 9 to 25 μm.