Read retry method in disk drive

A method for retrying a read operation upon detecting a read error of a disk drive, comprising the steps of:

• a) incrementally decreasing a revolution rate of a disk until the read error is corrected, with a read attempt being performed at each incrementally decreased revolution rate until a revolution rate is arrived at in which the error is corrected;
• b) if the read error is corrected, gradually increasing the revolution rate of the disk while a data read operation is performed;
• and,
• c) returning to step a) if another read error occurs at said increasing step.