SUPPORT FOR MAGNETIC RECORDING MEDIUM, AND MAGNETIC RECORDING MEDIUM

摘要

[Problem to be solved] To provide a substrate excellent in dimensional stability and crack resistance and capable of being used to produce a high density magnetic recording medium little dimensionally changing under environmental changes and small in error rate. [Solution] A magnetic recording medium substrate comprising a polyester film having metallic oxide-containing layers (layers M) formed on both the surfaces, one layer on each surface, the layers M having a thickness of 50 to 200 nm each, characterized in that the magnetic recording medium substrate has a total light transmittance of 0 to 75% and a surface resistivity of 1 x 10 2 to 1 x 10 13 © on each surface.