Abstract
In this study, multi-level joint-track readback scheme is proposed for interlaced magnetic recording (IMR) with write synchronization. IMR typically provides an areal density capability (ADC) gain by pre-fixing the recording orders as interlaced and customizing the write configurations for neighboring tracks, such that narrow and wide tracks are interlaced. On the other hand, due to the unbalanced track widths in IMR, readback waveforms by a single wide reader covering two adjacent tracks can be decomposed into four distinguishable levels, when tracks are recorded in a synchronous manner. By taking advantage of the four level (4L) detecting capability, the single reader based dual-track readback (SR-DTR) IMR has a potential to provide a doubled data rate (2X) retrieval. For the feasibility test of the SR-DTR IMR, numerical simulations are conducted for bit-error rate (BER) evaluations by the micro-pixelated magnetic recording channel model. Partial response equalizer and Viterbi detector are modified for 4L readback waveforms, and are investigated with cross-track read offsets under various track and linear densities. BER bathtub investigation results show the feasibility of 2X retrievals by the SR-DTR IMR approach.
Highlights
With dramatic increases of digital data generation1 and datadriven applications,2 demand for large capacity and fast data transferring information storage system is ever-increasing
Extra efforts made in the read channel side to provide an areal density capability (ADC) gain, where array-reader based magnetic recording (ARMR) is introduced7 to enhance the track and linear densities by suppressing and control the inter-track interference by customized joint equalization
Multi-level joint-track readback scheme is proposed for interlaced magnetic recording (IMR)
Summary
With dramatic increases of digital data generation and datadriven applications, demand for large capacity and fast data transferring information storage system is ever-increasing. Multi-level joint-track readback scheme is proposed for interlaced magnetic recording (IMR). Dual-track readback (DTR) IMR with an AR jointly covering neighboring tracks is investigated for doubling the read data rate but with complicated skew effects by multiple readers.. By synchronized writing of neighboring tracks in an interlaced manner, a single wide reader covering two-tracks jointly is capable of capturing four-level (4L) signals. Note that depending on the cross-track read offsets of the reader, balance between widely and narrowly recorded tracks can be broken, so that the centers of the four distinctive levels may not be evenly distributed any more In this manner, readback waveforms from the wide reader covering the two tracks are synthesized, and evaluated with 4L modified partial response (PR) equalizer and 4L detector.
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