Hard disk drive device

A hard disk drive comprising:

• a motor including:
• a rotor or hub having a downwardly depending flange at an outer periphery thereof, wherein said hub is journalled rotatably on a base by a bearing;
• said hub provided with a magnet positioned within an inner peripheral surface of the downwardly depending flange;
• a stator provided on the base so as to be opposed face to face with said magnet, said stator including coils;
• at least one magnetic disk having a standard outer diameter, said magnetic disk having a central aperture to be fitted around an outer peripheral surface of the flange provided around the hub of the motor, said magnetic disk adapted to be rotated by means of said motor,
• wherein said standard outer diameter is 3.5 inches (95 mm) and an inner diameter of the central aperture of a central aperture of a standard magnetic disk is 25 mm;
• and
• a disk restraining plate clamping said at least one magnetic disk to said hub;
• said disk restraining plate threadedly secured to said hub at a position over said magnet;
• wherein the inner diameter of said central aperture of said magnetic disk is larger than 25 mm which is the inner diameter of the central aperture of the standard magnetic disk standardized based on said standard outer diameter, and
• the outer diameter of the downwardly depending flange of said hub of the motor is enlarged to accommodate the larger inner diameter of said central aperture of said magnetic disk fitted thereon;
• said outer diameter of the downwardly depending flange of said hub being substantially identical with the larger inner diameter of said central aperture said magnetic disk.

A hard disk drive for a magnetic disk of a standard outer diameter comprising:

• a motor including;
• a rotor having a downwardly depending flange at an outer periphery thereof, said rotor rotatably journalled on a base of said motor by a bearing;
• a magnet positioned on an inner peripheral surface of the downwardly depending flange of said rotor;
• stator provided on the base in face to face opposition with said magnet, said stator including coils;
• at least one magnetic disk having said standard outer diameter, said at least one magnetic disk adapted to be rotated by said motor;
• said at least one magnetic disk having a central aperture to be fitted around the outer peripheral surface of said downwardly depending flange depending from said rotor;
• an inner diameter of said central aperture of said magnetic disk being larger than an inner diameter of central aperture of a standard commercial magnetic disk which is standardized based on said standard outer diameter,
• wherein said standard outer diameter is 2.5 inches (65 mm) and an inner diameter of a central aperture of a standard commercial magnetic disk standardized based on an outer diameter of 2.5 inches is 20 mm, and
• an outer diameter of said downwardly depending flange of said rotor being enlarged to accommodate the larger inner diameter of said central aperture said magnetic disk fitted thereon, said outer diameter of said downwardly depending flange being substantially identical with the larger inner diameter of said central aperture of said magnetic disk;
• wherein said at least one magnetic disk has an outer diameter of 2.5 inches and said inner diameter of the central aperture of said at least one magnetic disk is larger than 20 mm,
• said rotor comprises a hub portion and a central shaft portion, said flange depending downwardly from an outer periphery of said hub portion and said central shaft portion being journalled on said base by said bearing, and
• an inner diameter of said downwardly depending flange of said rotor being enlarged in accordance with enlargement of said outer diameter thereof,
• said enlarged outer diameter of said downwardly depending flange thereby providing an enlarged space between said central shaft portion of said rotor and said downwardly depending flange of said rotor for accommodating increased dimensions for said bearing and for said magnet positioned in said space.

A hard disk drive for a magnetic disk of a standard outer diameter comprising:

• a motor including;
• a rotor having a downwardly depending flange at an outer periphery thereof, said rotor rotatably journalled on a base of said motor by a bearing;
• a magnet positioned on an inner peripheral surface of the downwardly depending flange of said rotor;
• a stator provided on the base in face to face opposition with said magnet, said stator including coils;
• at least one magnetic disk having said standard outer diameter, said at least one magnetic disk adapted to be rotated by said motor;
• said at least one magnetic disk having a central aperture to be fitted around the outer peripheral surface of said downwardly depending flange depending from said rotor;
• an inner diameter of said central aperture of said magnetic disk being larger than an inner diameter of a central aperture of a standard commercial magnetic disk which is standardized based on said standard outer diameter,
• wherein said standard outer diameter is 3.5 inches (95 mm) and an inner diameter of a central aperture of a standard commercial magnetic disk standardized based on an outer diameter of 3.5 inches is 25 mm, and
• an outer diameter of said downwardly depending flange of said rotor being enlarged to accommodate the larger inner diameter of said central aperture of said magnetic disk fitted thereon, said outer diameter of said downwardly depending flange being substantially identical with the larger inner diameter of said central aperture of said magnetic disk;
• wherein said at least one magnetic disk has an outer diameter of 3.5 inches and said inner diameter of the central aperture of said at least one magnetic disk is larger than 25 mm,
• said rotor comprises a hub portion and a central shaft portion, said flange depending downwardly from an outer periphery of said hub portion and said central shaft portion being journalled on said base by said bearing, and
• an inner diameter of said downwardly depending flange of said rotor being enlarged in accordance with enlargement of said outer diameter thereof,
• said enlarged outer diameter of said downwardly depending flange thereby providing an enlarged space between said central shaft portion of said rotor and said downwardly depending flange of said rotor for accommodating increased dimensions for said bearing and for said magnet positioned in said space.