MAGNETIC DISC MEDIUM

PURPOSE:To enhance the strength of a coated film without damaging electric characteristics, the surface shape, the head floating capacity, etc. of a magnetic disc by using materials having a high thermal conductivity as a coated film reinforcing material. CONSTITUTION:A magnetic powder 4 and a coated film reinforcing material 2 are mixed and dispersed in a thermosetting resin and are applied onto an aluminium substrate 3. Materials having a thermal conductivity >=0.01cal/cm.sec. deg.C are used as the coated film reinforcing material 2. When a magnetic head 1 collides with a magnetic coated film 5, it is heated by intensive friction to the coated film reinforcing material 2. Since the particle size of the reinforcing material 2 is larger than the thickness of the magnetic coated film 5, the reinforcing material 2 and the magnetic head 1 rub against each other, and generated heat is diffused easily because the thermal conductivity of materials used as the coated film reinforcing material 2 is high, and generated heat is diffused to the aluminium substrate 3 and is not stored in the coated film 5, and thus, thermal decomposition and vaporization of a lubricant and destruction of a binder are difficult, and destruction of the coated film 5 is delayed.