Disk curvature detection using sector head-media spacing measurement in hard disk drive | |
| Author | Nitikul Phuchan |
| Call Number | AIT Thesis no.ISE-12-66 |
| Subject(s) | Curvature Hard disks (Computer science) |
| Note | A thesis submitted in partial fulfillment of the re quirements for the degree of Master of Science in Mechatronics, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ISE-12-66 |
| Abstract | As the requirement to improve or maintain magnetic recording performance of hard disk drive (HDD), the head-media spacing (HMS) is reduce d to a level of sub-10 nanometer technology. On one hand, smaller HMS will lead to a higher sensitivity and resolution of readback signal for read operation and stronger mag netic field for write operation. On the other hand, a wide range of head-media spacing vari ation can generate unexpected failures in HDD, such as head-disk interface (HDI), errors i n data writing or reading, and readback signal amplitude degradation due to physical damage of the read/write element. In particular, the variation of head-media spacing can be influenced by several causes, such as the write current pole tip protrusion (WPTP) and th e manufacturing tolerances. Therefore, there are various head-media spacing measurement te chniques proposed in order to understand interaction and determine a clearance be tween recording head and recording layer on the media surface. In addition to ability to improve or maintain magnetic recording performance, the HMS measurement can also be used in order to detect and protect an appearance of unexpected failures in reg ard to the variation of head-media spacing. In this thesis, the proposed technique called secto r head-media spacing measurement, which is one of the recording head readback signal technique, will be evaluated by applying advantages of Wallace spacing loss in orde r to detect disk curvature which causes high variation of HMS on the location especially at the inner of the recording disk. Furthermore, the result of the proposed technique w ill be compared with the current disk curvature detection technique in order to provide o r suggest the most efficient detection technique of disk curvature detection to be implemented in the HDD test process. |
| Year | 2012 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ISE-12-66 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Industrial Systems Engineering (DISE) |
| Academic Program/FoS | Industrial Systems Engineering (ISE) |
| Chairperson(s) | Bargmann, Brent |
| Examination Committee(s) | Afzulpurkar, Nitin V.;Charin Thongjantanam |
| Scholarship Donor(s) | Western Digital;NECTEC;Asian Institute of Technology Fellowship |
| Degree | Thesis (M. Sc.) - Asian Institute of Technology, 2012 |