Writer having a shield structure for adjacent and far track interference refreshment

A data storage system, comprising:

• a magnetic head, comprising:
• a main magnetic pole;
• and
• a wrap around shield (WAS) positioned around the main magnetic pole at an air bearing surface (ABS) thereof, wherein a maximum width in a crosstrack direction of the WAS exposed at the ABS is narrower than a predetermined risk range measured in the crosstrack direction;
• a magnetic medium;
• a drive mechanism for passing the magnetic medium over the magnetic head;
• and
• a controlling mechanism electrically coupled to the magnetic head for controlling operation of the magnetic head that initiates rewriting of information of a recording track of the magnetic medium if a recording magnetic field applied to the recording track exceeds a threshold value.

A method for storing data to a magnetic medium, the method comprising:

• writing data to a first track of a magnetic medium using a magnetic head;
• determining characteristics consistent with data degradation from tracks adjacent to the first track and far tracks away from the first track using a controlling mechanism;
• and
• rewriting data in tracks determined to be degraded due to adjacent track interference (ATI) and/or far track interference (FTI),
• wherein the magnetic head comprises:
• a main magnetic pole;
• and
• a wrap around shield (WAS) positioned around the main magnetic pole at an air bearing surface (ABS) thereof, wherein a maximum width in a crosstrack direction of the WAS exposed at the ABS is narrower than a predetermined risk range measured in the crosstrack direction;
• and
• wherein the controlling mechanism is electrically coupled to the magnetic head for controlling operation of the magnetic head and initiates rewriting of information of a recording track of the magnetic medium if a recording magnetic field applied to the recording track exceeds a threshold value.