Flexible magnetic disc, positioning apparatus and method permitting improved head contact

摘要

A flexible magnetic disc for use in combination with a magnetic head assembly which includes a regulator plate and performs magnetic recording or playback by protruding a magnetic head beyond a predetermined support level of a rotatable sheet of magnetic recording medium at least by an amount which is substantially equal to a total thickness of the recording medium. Assuming that the recording medium has a total thickness of t millimeters (mm) and a Young's modulus of E grams per square millimeter (g/mm2), a product of the Youngs's modulus E and the third power of the total thickness t, i.e. Et3, lies in a range between a lower limit of 2.5 g.mm and an upper limit of 36 g.mm inclusive of the lower and upper limits.