# US 2012/0075744 A1 · Method of optimizing flying height of head and hard disk drive manufactured by the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2012/0075744 A1 - Document ID: US20120075744A1 - Status: Published application - Kind: A1 - Application number: 13/233,845 - Filed: 2011-09-15 - Published: 2012-03-29 - Earliest claimed: 2010-09-27 - Assignees: Samsung Electronics Co., Ltd. - Inventors: Seong Yong YOON; Myung Wook Song; Chang-Hwan Lee; Su-Hyeon Kim - Web page: https://patentgrep.com/patent/US20120075744A1 ## CPC - G11B 5/6017: {using capacitive measurement} - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract A hard disk drive includes a controller that optimizes a flying height of a head of a hard disk drive. The controller determines an optimal flying height of a head based on a preset table value and an MRR value of a head measured during a hard disk drive manufacturing process and sets the head according the determined optimal flying height such that recording capacitance is improved. ## Claims ### Claim 1 A method of optimizing a flying height of a head of a hard disk drive, the method comprising: measuring at least one parameter value with respect to the flying height of the head and a recording capacitance value of the hard disk drive corresponding to the parameter value and generating a predetermined table including measured values based on the at least one measured parameter value; and optimizing the flying height of the head by comparing a measured process parameter value corresponding to at least one hard disk drive manufacturing process with at least one measured value of the table. ### Claim 2 (depends on 1) The method of claim 1, wherein the optimizing of the flying height of the head comprises: measuring the process parameter value in the at least one hard disk drive manufacturing process; and comparing the measured process parameter value of the at least one manufacturing process with a corresponding measured value of the table. ### Claim 3 (depends on 2) The method of claim 2, wherein the optimizing of the flying height of the head further comprises: selecting an optimal recording capacitance value among the measured values of the table corresponding to the parameter value; and optimizing the flying height of the head by resetting the flying height of the head based on the optimal recording capacitance value. ### Claim 4 (depends on 3) The method of claim 3, wherein the optimal recording capacitance value is a maximum value among the recording capacitance values of the table. ### Claim 5 (depends on 1) The method of claim 1, wherein the parameter value is selected from an MRR (magnetic resistor resistance) value of the head, an EWAC (write width including an erase band width by an AC field) value of the head, an MRR value of the hard disk drive, and an EWAC value of the hard disk drive, and the hard disk manufacturing process comprises a head stack assembly assembling process, a servo write process, a function test process, a burn-in process, and a final test process. ### Claim 6 (depends on 5) The method of claim 5, wherein the MRR value of the head is measured in at least any one process selected from the entire processes of the hard disk drive manufacturing process. ### Claim 7 (depends on 5) The method of claim 5, wherein the EWAC value of the head is measured during the burn-in process. ### Claim 8 (depends on 1) The method of claim 1, wherein the measuring of each of a parameter value with respect to the flying height of the head, and a recording capacitance value of the hard disk drive corresponding to the parameter value and the generating of a predetermined table based on measured values, comprises: defining a type of the head; selecting a flying height of the head; measuring at least one parameter value based on the flying height of the head; and measuring recording capacitance of the hard disk drive according to a measured parameter value. ### Claim 9 (depends on 1) The method of claim 1, wherein the table generated in the measuring of a parameter value with respect to the flying height of the head and a recording capacitance value of the hard disk drive corresponding to the parameter value and the generating of a predetermined table based on measured values is stored in a memory or on a disk. ### Claim 10 A hard disk drive comprising: a head to read/write information with respect to a disk; and a controller in electrical communication with a memory unit to optimize a flying height of a head by comparing parameter values measured corresponding to a hard disk drive manufacturing process with a pre-generated table stored in the memory unit, wherein the table is generated based on measured values of a parameter value with respect to the flying height of the head and a recording capacitance value of the hard disk drive corresponding to the parameter value. ### Claim 11 (depends on 10) The hard disk drive of claim 10, wherein the controller measures the parameter value in any one process selected from the hard disk drive manufacturing process, compares a measured parameter value with values on the table, selects an optimal recording capacitance value of the corresponding values on the table corresponding to the parameter value, and controls optimization of the flying height of the head by resetting the flying height of the head based on the optimal recording capacitance value. ### Claim 12 (depends on 11) The hard disk drive of claim 11, wherein the optimal capacitance value is a maximum value of the recording capacitance values on the table. ### Claim 13 (depends on 10) The hard disk drive of claim 10, wherein the parameter value is selected from an MRR (magnetic resistor resistance) value of the head, an EWAC (write width including an erase band width by an AC field) value of the head, an MRR value of the hard disk drive, and an EWAC value of the hard disk drive, and the hard disk manufacturing process comprises a head stack assembly assembling process, a servo write process, a function test process, a burn-in process, and a final test process. ### Claim 14 (depends on 13) The hard disk drive of claim 13, wherein the MRR value of the head is measured in at least any one process selected from the entire processes of the hard disk drive manufacturing process, and the EWAC value of the head is measured in the burn-in process. ### Claim 15 A hard disk drive module including at least one disk to store data, the hard disk drive module comprising: a head disposed above the at least one disk and adjustable according to a flying height; memory unit to store a plurality of parameters measured during a pre-determined manufacturing process of the hard disk drive module; and a controller in electrical communication with the memory unit to output a plurality of control signals in response to each measured parameter among the plurality of measured parameters such that each control signal sets the head at a corresponding flying height, wherein a recording capacitance of the hard disk drive module is measured at each flying height set by the corresponding control signal generated by the controller. ### Claim 16 (depends on 15) The hard disk drive module of claim 15, wherein the pre-determined manufacturing process is a burn-in process. ### Claim 17 A method of optimizing a flying height of a head included in a hard disk drive module including at least one disk to store data, the method comprising: storing a plurality of parameters measured during a pre-determined manufacturing process of the hard disk drive module; setting the head at a plurality of flying heights, each flying height corresponding to a measured parameter among the plurality of measured parameters; and measuring a recording capacitance of the hard disk drive module at each set flying height. ### Claim 18 (depends on 17) The method of claim 17, wherein the pre-determined manufacturing process is a burn-in process. ### Claim 19 (depends on 17) The method of claim 17, wherein the plurality of parameters includes a magnetic resistor resistance (MRR) value of the head and a write width including an erase band width by an AC field (EWAC) of the head. ### Claim 20 A method of optimizing a flying height of a head of a hard disk drive, the method comprising: determining a manufacturing process of the hard disk drive during which to optimize the flying height of the head; measuring during the determined manufacturing process a parameter of the head to be cross-referenced with a pre-determined parameter listed in a pre-generated table stored in a memory unit; matching the measured parameter with the pre-determined parameter to determine a corresponding recording capacitance of the head; and adjusting the flying height of the head according to the determined recording capacitance.