Systems and methods for format efficient calibration for servo data based harmonics calculation

A data processing system, the data processing system comprising:

• a first data source;
• a second data source;
• an input circuit configurable to receive data from the first data source during a servo data processing period, and configurable to receive data from the second data source during a user data processing period;
• and
• a harmonic calculation circuit, wherein the harmonic calculation circuit is operable to calculate a first harmonic value based on data derived from the first data source and to calculate a second harmonic value based on data derived from the second data source.

A hard disk drive system, wherein the system comprises:

• a storage medium;
• a read/write head assembly operable to receive a first data set from the storage medium;
• a periodic data circuit operable to provide a periodic data set;
• an input circuit configurable to receive the first data set during a servo data processing period, and one of the periodic data set and a second data set from the storage medium during a user data processing period;
• and
• a harmonic calculation circuit, wherein the harmonic calculation circuit is operable to calculate a first harmonic value based on a portion of the first data set, and to calculate a second harmonic value based at least in part on of the periodic data set.