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Head disk interface prediction using the servo variable gain amplifier and head media spacing | |
Author | Weerayoot Wachirapornpongsa |
Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Microelectronics and Embedded Systems, School of Engineering and Technology |
Publisher | Asian Institute of Technology |
Abstract | Head disk contact is one of the main issue in hard disk drive manufacturing which can cause head damage. This thesis study new method to avoid head and disk to be in contact by using predictive data of servo variable gain amplifier (SVGA). SVGA at head touchdown will be predicted from curve fitting data between head-media fly height and SVGA which were collected at different fly height distance. Head-media fly height will be adjusted for each data collection loop to avoid head touch down on the media. The predictive SVGA at head touchdown will be used as a reference SVGA to map out all those bad track that might come closer to head touchdown. This thesis research also convert data of predictive SVGA of each data zone to heater power to be able to compare result data with touchdown power from the conventional method. The discussion and experimental result of bad track detection with this thesis method was included in this thesis as well. |
Year | 2015 |
Type | Thesis |
School | School of Engineering and Technology (SET) |
Department | Department of Industrial Systems Engineering (DISE) |
Academic Program/FoS | Microelectronics (ME) |
Chairperson(s) | Mongkol Ekpanyapong; |
Examination Committee(s) | Bohez, Erik L. J.;Bundit Jangsrisert; |
Scholarship Donor(s) | Western Digital - AIT Fellowship; |