Hard disk driving apparatus using surface-treating method

A disk drive, comprising:

• a base having a substantially rectangular shape and having first and second plurality of threaded nuts integrally formed therein;
• a recording medium;
• rotating means mounted on the base, for rotating the recording medium;
• actuator means rotatably mounted on the base, for supporting a transducer head for recording and reading information on the recording medium;
• a voice coil motor assembly for enabling said actuator means to rotate substantially in a radial direction of the recording medium, said voice coil motor assembly comprising:
• a bottom plate having a first magnet attached thereon, mounted on said base by screwing a first plurality of screws into the first plurality of threaded nuts of said base via corresponding tapped holes formed in said bottom plate, said bottom plate having an exterior surface protected by a protection film;
• a top plate having a pair of legs at opposite end portions bent into a L-shape and having a second magnet attached thereon an interior surface, mounted on said bottom plate by screwing a second plurality of screws into the second plurality of threaded nuts of said base via respective holes of the legs and corresponding tapped holes formed in said bottom plate, said top plate having said interior surface protected by a protection film prior to being drawn against said bottom plate;
• and
• a coil mounted on said actuator means and disposed between said first and second magnets, for interacting with said magnets to produce magnetic fluxes enabling said actuator means to rotate substantially in the radial direction of the recording medium.