CPC G11B 5/62 (2013.01) [G11B 5/59688 (2013.01); G11B 5/68 (2013.01); G11B 5/70678 (2013.01); G11B 5/733 (2013.01); G11B 5/7358 (2019.05)] | 19 Claims |
1. A magnetic recording medium comprising:
a layer structure including a magnetic layer, a non-magnetic layer, and a base layer in order,
in which an average thickness tT of the magnetic recording medium is 4.0 μm≤tT≤5.3 μm,
the magnetic layer includes a plurality of servo bands along a longitudinal direction of the magnetic recording medium,
the magnetic layer includes a magnetic powder and a first binder,
the non-magnetic layer includes a non-magnetic powder and a second binder,
the base layer includes a polyester,
a dimensional variation Δw in a width direction of the magnetic recording medium to tension change in the longitudinal direction of the magnetic recording medium is 680 ppm/N≤Δw≤2000 ppm/N,
a squareness ratio measured in the longitudinal direction of the magnetic recording medium is 35% or less,
an average thickness tn of the non-magnetic layer is 0.03≤tn≤1.0 μm, and
wherein the dimensional variation Δw is determined according to:
where D(0.2N) and D(1.0N) represent widths of a sample of the magnetic recording medium subject to loads of 0.2N and 1.0N, respectively, in the longitudinal direction of the magnetic recording medium and under a measurement environment including a temperature of 25° C. and a relative humidity of 50% and a width of the sample of the magnetic recording medium is ½ inch prior to being subject to a load under the measurement environment including the temperature of 25° C. and the relative humidity of 50%.
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