System design for readback above 1 Tbit/In2 from granular media

R. H. Victora, Yao Wang

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The performance of a rotated sense head is examined for densities of 2-7 Tbits/in2 recorded on granular media, such as that envisioned for 2-D magnetic recording. The key idea is that tightly placed shields are used to guarantee the resolution in the cross-track direction, and oversampled signal processing regains the lost resolution in the down-track direction. It also avoids the necessity for a complex 2-D detector and head array, or latency issues if a single head were employed in the normal orientation. Simulation shows that the new design achieves a density gain of 1.7X (single head) and 2.1X (head array) over a normally oriented single head at a target bit error rate (BER) of 10-3 with sampling period of 2 nm, minimum mean square error equalizer, and Viterbi detector. The new design shows greatly reduced BER relative to a normally oriented single head for all densities, including a very few grains per channel bit (<2).

Original languageEnglish (US)
Article number6774967
Pages (from-to)31-36
Number of pages6
JournalIEEE Transactions on Magnetics
Issue number3
StatePublished - Mar 2014


  • Granular media
  • Magnetoresistive head
  • Two-dimensional magnetic recording (TDMR)


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