Method of operating a data storage apparatus and data storage apparatus

A data storage apparatus, comprising:

• a recording medium comprising:
• a data layer, and
• a servo layer provided under the data layer;
• a sensor head for interacting with the recording medium;
• and
• a controller configured to send and receive signals with the sensor head in carrying out any one of a read operation or a write operation with the sensor head and the recording medium, the controller comprising:
• a write control module configured to provide signals to the sensor head to write a data signal into a portion of the data layer,
• an interference estimation module configured to read a servo signal from the servo layer, determine a data layer coupling response in the servo signal, and calculate, based on the data layer coupling response in the servo signal, a data layer coupling interference value, and
• an interference writing module configured to provide signals to the sensor head to write the data layer coupling interference value onto the recording medium.