Methods of optimizing recording current and setting recording density of hard disk drive

A method of optimizing a recording density of a hard disk drive, comprising:

• measuring a rate of errors in data recorded on a target track under a predetermined adjacent track erasure (ATE) test condition;
• comparing the rate of errors with a predetermined threshold;
• and
• adjusting the recording density by changing tracks per inch (TPI) when the rate of errors is larger than the predetermined threshold.

A method, comprising:

• for a range of operating temperatures for a hard disk drive, measuring a rate of errors for a range of values of a recording parameter;
• selecting and storing the recording parameter value corresponding to a minimum rate of errors for a given operating temperature;
• monitoring the operating temperature during recording to the hard disk drive;
• and
• employing the stored recording parameter value corresponding to the monitored operating temperature.

A method, comprising:

• determining a range of values of a recording parameter for a hard disk drive;
• for at least one recording parameter value in the range,
• recording data on a target track a first predetermined number of times,
• recording data on tracks adjacent to a target track a second predetermined number of times,
• reading the data from the tracks adjacent to the target track a third predetermined number of times, and
• determining a number of recording errors for the recording parameter value;
• calculating a total of the recording errors for the respective recording parameter values;
• comparing the total to a predetermined threshold;
• if the total is greater than the predetermined threshold, setting a recording density of the hard disk drive to a first value;
• and
• if the total is not greater than the predetermined threshold, setting the recording density of the hard disk drive to a maximized value.