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Write current optimization for magnetic recording system |
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| รหัสดีโอไอ | |
| Creator | 1. Pornchai Pliamsup 2. Pornchai Supnithi 3. Kanawat Senanan |
| Title | Write current optimization for magnetic recording system |
| Publisher | Faculty of Engineering, Khon Kaen Univeristy |
| Publication Year | 2554 |
| Journal Title | KKU Engineering Journal |
| Journal Vol. | 38 |
| Journal No. | 3 |
| Page no. | 233-242 |
| Keyword | write current optimization, write current amplitude, write current overshoot, write current duration,squeeze,BER |
| ISSN | 0125-8273 |
| Abstract | In this paper, we propose a method of write current optimization based on the contour graph. The contour graph is plotted from bit error rate (BER) which obtaining from running the full write current combination. In optimization process, we consider the write current effect to the system performance such as protrusion level of heads and adjacent-track interference (ATI) effect from recording head following upon the write current amplitude variation and the write current duration is considered. Increasing the write current overshoot causes the transition shift or inter-symbol interference (ISI). Before selecting the write current, the optimization is squeezed measure the performance of each. In the proposed method, first, we run the full combination of the write current including write current amplitude, write current overshoot and write current duration. Then we plot the contour graph between the write current amplitude and the write current duration, and select the best write current overshoot that gives the widest BER area. Next, we select three upward edge points of the write current duration. On the contrary, we plot the contour graph between the write current amplitude and the write current overshoot, and select the best write current duration that gives the widest BER area, select three upward edge points of the write current overshoot. After that, we select eight points of the write current amplitude, and then we get 24 sets of the write current. Finally, we select eight sets of the best write triplet. We can deduce from the experimental result that, the proposed method gives better performance than the baseline method. Moreover, we observe that the fixed write current duration yields higher performance than the fixed write current overshoot. However, in the unsqueezed mode, the result is in contrast because the write current overshoot affects to the system performance more than the write current duration. |
