| 摘要 |
A cleaning medium comprising: a backcoat layer; a nonmagnetic support; and a cleaning layer containing ferromagnetic powder and a binder, in this order, wherein the cleaning layer has projections having a height of 10 nm or higher on a surface of the cleaning layer at a density of from 0.10 to 5.0/mum2 and a surface microhardness of from 294 to 784 MPa.
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