An inputoutput control method and apparatus optimized for a flash memory, which can improve the performance of the flash memory. In one major aspect of the invention, the membranes are hydrophobic membranes that are treated with one or more polymeric wetting agents to render the membranes substantially hydrophilic, followed by treatment with one or more charge-modifying agents, the agents causing the membranes to possess a fixed formal positive charge. Said deflecting structures deflect light along a transmission direction that is inclined with respect to said crystal axis, causing a phase shift between the field components of the transmitted light. The procedures includes preparation of extractive solution, concentration, phase separation, drying, washing with solvent, cooling, filtration and drying of the final products. Thereby, the magnetic recording medium having microscopic magnetic property and structural property suitable to a high density magnetic recording medium is realized.