Abstract
The ever-increasing demand for data in recent times has led to the emergence of big data and cloud data. The growth in these fields has necessitated that data be centrally stored in data centers. To meet the need for large-scale storage systems at data centers, innovative technology such as bit-pattern media recording (BPMR) has been developed. With BPMR technology, we are able to achieve significant improvements in high areal density (AD) of magnetic data storage systems. However, two-dimensional (2D) interference is a common issue faced with high AD. Intersymbol interference and intertrack interference occur when the distance between the islands is decreased in the down-track and cross-track, respectively. 2D interference adversely affects the performance of BPMR. In this paper, we propose an improved modified Viterbi algorithm (MVA) exploiting a feedback and a new 2D three-way form of a generalized partial response (GPR) target. The proposed MVA with feedback is superior to the previous MVA by eliminating intertrack interference (ITI) more effectively. With the three-way GPR target, the proposed algorithm achieves more stable performance compared to the previous detection algorithms for the track misregistration effect.
Highlights
With the proliferation of electronic devices, more data are constantly being generated and consumed on a daily basis
5 × 5; the equalizer coefficients and the generalized partial response (GPR) target were estimated by calculating the error signal e[j,k] and applying the minimum mean square error (MMSE) algorithm [20]
We presented a detection method that has improved bit error rate (BER) performance compared to the modified Viterbi algorithm (MVA) [12]
Summary
With the proliferation of electronic devices, more data are constantly being generated and consumed on a daily basis. The areal density (AD) for magnetic storage is limited to approximately 1 terabit per square inch (Tb/in2) (0.155 Tb/cm2) owing to the superparamagnetic phenomenon [2] To combat this problem, several new technologies have been proposed, such as heat-assisted magnetic recording [3], microwave-assisted magnetic recording [4], two-dimensional (2D) magnetic recording [5], and bit-patterned media recording (BPMR) [6]. Owing to the increase in 2D interference, such as ISI and ITI, the BPMR channel performance in terms of bit error rate (BER) is negatively affected. Jeong and Lee [7] proposed the use of modulation code and multilayer perceptron decoding for BPMR to reduce and correct errors due to ITI, respectively. In this paper, we propose a three-way GPR utilizing a three-way MVA [12] with feedback.
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