Improvement of Read Back Properties in HDD with PRML Signal Processing Method
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概要
- 論文の詳細を見る
A series of micromagnetic models are utilized to study the recording performance in hard disk drives (HDD) at extremely high densities, including simulations of the 3D thin film write head field, the GMR read head, the thin film media and channel codes. By these models the read & write process in longitudinal magnetic recording media of HDD are analyzed. The (0, 4/4) encoder and the corresponding decoder are utilized to translate the user data into (0, 4/4) constrained codes, before the write process is performed. The write current is achieved from the constrained code in the NRZ format. The read back voltage is equalized to PR-IV signal and the viterbi detector is utilized to recover the data. In a medium of 10 nm grains, the recording density limits with PRML method are about 1000kfci, which is 1.5 times of those with PD method, indicating that PRML is an useful approach to improve the read back properties of HDD.
- 2002-10-31
著者
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Liang X
Lab Of Advanced Materials Dept. Of Materials Science And Engineering Tsinghua University
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Liang Xiaobing
Lab of Advanced Materials, Dept. of Materials Science and Engineering, Tsinghua University
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Wei Dan
Lab of Advanced Materials, Dept. of Materials Science and Engineering, Tsinghua University
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Wei Dan
Lab Of Advanced Materials Department Of Materials Science And Engineering Tsinghua University
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Liang Xiaobing
Lab Of Advanced Materials Dept. Of Materials Science And Engineering Tsinghua University
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