Magnetic disk device, adjusting method thereof, and manufacturing method thereof

A manufacturing method for a magnetic disk device including a disk, a head that writes data on the disk, a controller circuit that outputs write data and a control signal related to the write data, and an integrated circuit that outputs a write current to the head, the method comprising:

• adding a delay to a timing of polarity inversion of one bit of the write data or the control signal;
• outputting the write data and the control signal added with the delay from the controller circuit to the integrated circuit;
• outputting from the integrated circuit to the head, the write current having a current value that is changed at one of timings of polarity inversion of the write data, according to the control signal;
• and
• adjusting a deviation between the write data and the control signal, based on the output write current.

A magnetic disk device comprising:

• a disk;
• a head that writes data on the disk;
• a controller circuit that outputs write data and a control signal related to the write data, adds a delay to a timing of polarity inversion of one bit of the write data or the control signal, and outputs the write data and the control signal added with the delay;
• and
• an integrated circuit that outputs a write current having a current value that is changed at one of timings of polarity inversion of the write data input from the controller circuit, to the head according to the control signal input from the controller circuit,
• wherein the controller circuit adjusts a deviation between the write data and the control signal, based on the output write current.