Information recording device

An information recording device in which magnetic fields are applied to small regions of a rotatable disk-like recording medium having magnetizations in small regions on a surface to invert the directions of magnetization of the small regions so as to record information on the recording medium, comprising:

• a recording head, fixed to a distal end of an arm having a predetermined rotating center and a distal end moving on the recording medium in a diameter direction of the recording medium, for recording information by applying magnetic fields to the small regions when the magnetic head relatively moves with respect to the recording medium while being near or in contact with the recording medium to pass on the small regions of the recording medium;
• and
• a recording head controller for controlling the recording head to cause the magnetic head to apply magnetic fields to the small regions in a predetermined region of the recording medium to uniform the directions of magnetization of the small regions so as to erase the information in the predetermined region, and for causing the recording head to apply magnetic fields to the small regions of the predetermined region in which the information is erased at timings depending on the directions of the magnetic fields to record information.