Magnetic recording apparatus and method of writing data at low temperature

A magnetic recording apparatus comprising:

• a magnetic recording medium;
• a magnetic head including a recording magnetic pole and an excitation coil for producing a magnetic field for exciting the recording magnetic pole so as to record information on the magnetic recording medium;
• a temperature measuring means and a head amplifier having a write gate;
• a terminal for receiving a signal from a host device;
• a hard disc controller connected to the terminal;
• and
• an actuator, wherein
• the actuator, upon reception of a recording command from the host device via the terminal, moves the magnetic head to a track on the recording medium that is designated by the hard disc controller,
• the head amplifier opens the write gate after the settling of the magnetic head and prior to the recording of the recording data in a sector by the magnetic head, and
• the intensity of the recording current sent from the head amplifier to the excitation coil is varied depending on the temperature measured by the temperature measuring means.

A magnetic recording apparatus comprising:

• a magnetic recording medium;
• a magnetic head including a recording magnetic pole and an excitation coil for producing a magnetic field for exciting the recording magnetic pole so as to record information on the magnetic recording medium;
• a terminal for receiving a signal from a host device;
• a hard disc controller connected to the terminal;
• a temperature measuring means and a head amplifier;
• and
• an actuator, wherein
• the actuator, upon reception of a recording command from the host device via the terminal, moves the magnetic head to a track on the recording medium that is designated by the hard disc controller,
• a recording current is caused to flow in the excitation coil after the settling of the magnetic head and before the magnetic head arrives at a sector where the recording data is to be recorded, and
• the intensity of the recording current sent from the head amplifier to the excitation coil is varied depending on the temperature measured by the temperature measuring means.

A magnetic recording apparatus comprising:

• a magnetic recording medium;
• a magnetic head including a recording magnetic pole and an excitation coil for producing a magnetic field for exciting the recording magnetic pole so as to record information on the magnetic recording medium;
• a temperature measuring means and a head amplifier;
• and
• a terminal for receiving a signal from a host device, wherein
• the head amplifier, upon reception of a recording command from the host device via the terminal, produces a recording current comprising dummy data to which recording data sent from the host device is added and transmits the recording current to the magnetic head, and
• the intensity of the recording current sent from the head amplifier to the excitation coll is varied depending on the temperature measured by the temperature measuring means.

A magnetic recording apparatus comprising:

• a magnetic recording medium;
• means for recording information on the magnetic recording medium including a magnetic head having a recording magnetic pole and an excitation coil for producing a magnetic field for exciting the recording magnetic pole so as to record information on the magnetic recording medium;
• means for transmitting a recording current to the recording means;
• means for receiving a signal from a host device;
• means for receiving a signal from the terminal and for controlling the recording-current transmission means;
• and
• a temperature measuring means and a head amplifier, wherein
• the transmission means, after the signal reception means receives a recording command from the host device, produces a recording current corresponding to recording data received by the signal reception means from the host device and to dummy data, and transmits the current to the recording means, and
• the intensity of the recording current sent from the head amplifier to the excitation coil is varied depending on the temperature measured by the temperature measuring means.