HEAD TEST METHOD OF A HARD DISK DRIVE, FOR PREVENTING AN ERROR CAUSED BY A HEAD HAVING A SMALL DEGREE OF INFERIORITY BY PREVIOUSLY SORTING OUT THE HEAD

摘要

PURPOSE: A head test method of a hard disk drive is provided to perform a write/read test for a head while an unsaturated current is applied, and to off-track the head while a saturated current is applied, then to test whether an off track write operation influences an adjacent track, thereby previously sorting out a head having a small degree of inferiority to prevent an error. CONSTITUTION: A micro controller locates a head to be tested on a specific track(110). The micro controller applies an unsaturated current to the head(112), and performs a write/read test in the first data patterns(114). The micro controller compares read data with written data, and carries out a squeeze test if an error is not generated(200). The micro controller decides whether an error is generated during the squeeze test(118). If so, the micro controller displays that the head is inferior(120).