Being the system and the methodological null memory device for the flying height control which uses

摘要

Various execution examples of this invention offer the system and method in order to decide flying height adjustment value. For example, various execution examples of this invention, memory medium (278), facing to memory medium, the reading/write head assembly, and the SAM based flying height adjustment circuit which are arranged (214) offer the memory device which is included. Memory medium (278), each includes the servo address mark (154) the plural servo data areas which are included (110). The SAM based flying height adjustment circuit (214) you grasp and/the write head assembly (276) through, the plural servo data areas (110) from the servo address mark (154) you receive, 1st harmonic ratio (445) you calculate on the basis of the reception data, 1st harmonic ratio (445) you grasp 2nd harmonic ratio (450) with by comparison and/the write head assembly (276) with memory medium (278) with distance (295) error (365) decide.