US Patent 10923148 Magnetic recording medium

There is provided a magnetic recording medium which has a layer structure including a magnetic layer and a base layer, and of which an average thickness tT is tT≤5.6 μm, a dimensional change amount Δw in a width direction with respect to a change in tension in a longitudinal direction is 660 ppm/N≤Δw, a servo pattern is recorded on the magnetic layer, a standard deviation σPES of a position error signal (PES) value obtained from a servo signal in which the servo pattern is reproduced is σPES≤25 nm, and a maximum value μ1M of a friction coefficient μ1 between a surface on a side of the magnetic layer and an LTO3 head in a case where measurement of the friction coefficient μ1 is performed 250 times is 0.04≤μ1M≤0.5.