BPI CONTROL METHOD FOR DISK AND HARD DISK DRIVE CONTROLLED BY THE SAME

摘要

PURPOSE: A BPI control method for a disk and a hard disk drive controlled by the same are provided to increase capacity by controlling a BPI based on the difference of read and write performance. CONSTITUTION: A controller measures an OW(Over Write) or a BER(Bit Error Rate) along the columnar direction of a disk surface according to each servo signal(S11). The controller calculates the amount of change of the OW or the BER by comparing a target OW or BER according a base setting value with a measured OW or BER and sets a BPI modification value per servo signal(S12). When a read/write operation is progressed, the controller provides a corresponding BPI as a corresponding servo signal based on the BPI modification value per servo signal(S13). [Reference numerals] (S11) Estimating OW or BER according to a circumferential direction of a disk surface in each sub signal; (S12) Setting a BPI corrected value in each sub signal according to change amount of the calculated BER or OW; (S13) Providing BPI to a corresponding sub signal based on BPI corrected value in each sub signal when read and writing operation is executed