Method for recording a positioning signal on a magnetic recording disk and apparatus for recording the same

A method for recording a positioning signal on a magnetic disk comprising:

• rotating said magnetic disk having a magnetic layer on a non-magnetic substrate having a projection pattern thereon, wherein said projection pattern includes a projection portion, disposing a first magnet having a length of equal or longer than the diameter of said magnetic disk and a second magnet having a length of equal or longer than the diameter of said magnetic disk so as to put said magnetic disk therebetween and face one pole of said first magnet to opposite pole of said second magnet and space apart in the direction of the plane of said magnetic disk whereby to magnetize said whole magnetic layer of said magnetic disk in the first direction, then rotating said magnetic disk, flowing a DC current to a magnetic head, moving said magnetic head in the direction of the diameter over said magnetic disk whereby to magnetize only said magnetic layer of the projection portion of said magnetic disk in a second direction opposite to the first direction.

A method for recording a positioning signal on a magnetic disk comprising:

• rotating said magnetic disk having a magnetic layer on a non-magnetic substrate having a projection pattern thereon, wherein said projection pattern includes a projection portion, disposing a first magnet having a length of equal or longer than the diameter of said magnetic disk and a second magnet having a length of equal or longer than the diameter of said magnetic disk so as to put said magnetic disk therebetween and face one pole of said first magnet to opposite pole of said second magnet and space apart in the direction of the plane of said magnetic disk whereby to magnetize said whole magnetic layer of said magnetic disk in a first direction, then rotating said magnetic disk, disposing a third magnet having a length of equal or longer than the diameter of said magnetic disk over said magnetic disk, or disposing the third magnet having a length of equal or longer than the diameter of said magnetic disk and a fourth magnet having a length of equal or longer than the diameter of said magnetic disk over the same side of said magnetic disk whereby to magnetize only said magnetic layer of the projection portion of said magnetic disk in a second direction opposite to the first direction.

An apparatus for recording a positioning signal on a magnetic disk comprising:

• a rotating means to rotate said magnetic disk having a magnetic layer on a non-magnetic substrate having a projection pattern thereon,
• a magnetic head to magnetize said magnetic disk and change a pole and dimension of a DC current which flows to said magnetic head,
• a moving means to move said magnetic head in the direction of the diameter over said magnetic disk.

An apparatus for recording a positioning signal on a magnetic disk comprising:

• a rotating means to rotate said magnetic disk having a magnetic layer on a non-magnetic substrate having a projection pattern thereon and change a number of revolutions,
• a magnetic head to magnetize said magnetic disk and change a pole of a DC current which flows to said magnetic head,
• a moving means to move said magnetic head in the direction of the diameter over said magnetic disk.

An apparatus for recording a positioning signal on a magnetic disk comprising:

• a rotating means to rotate said magnetic disk having a magnetic layer on a non-magnetic substrate having a projection pattern thereon, a first magnet having a length of equal or longer than the diameter of said magnetic disk and a second magnet having a length of equal or longer than the diameter of said magnetic disk disposed so as to put said magnetic disk therebetween and face one pole of said first magnet to opposite pole of said second magnet and space apart in the direction of the plane of said magnetic disk,
• a magnetic head to magnetize said magnetic disk and change a pole of a DC current which flows to said magnetic head,
• a moving means to move said magnetic head in the direction of the diameter over said magnetic disk.

An apparatus for recording a positioning signal on a magnetic disk comprising:

• a first magnet having a length of equal or longer than the diameter of said magnetic disk and a second magnet having a length of equal or longer than the diameter of said magnetic disk disposed so as to put said magnetic disk therebetween and face one pole of said first magnet to opposite pole of said second magnet and space apart in the direction of the plane of said magnetic disk, a third magnet having a length of equal or longer than the diameter of said disk over said magnetic disk and/or a fourth magnet having a length of equal or longer than the diameter of said magnetic disk over the same side of said magnetic disk.