Method for producing a magnetic recording medium

摘要

In production of a magnetic recording medium by formation of an anodic oxide layer on an Al or Al-base alloy substrate and preapitation via electrolysis of magnetic substance in pores in the anodic oxide layer, the substrates are mounted at equal intervals to a common combination shaft made up of several components for a compact constructions and uniform electrolytic effect. Preferably, a specified annular region around the center hole of each substrate is sealed against formation of a surface layer.