PRML Systems for Perpendicular Magnetic Recording Using a Double-layered Medium and an MR Head

Osawa, Hisashi; Okamoto, Yoshihiro; Saito, Hidetoshi; Muraoka, H.; Nakamura, Y.

doi:10.3379/jmsjmag.22.s3_33

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Noise Power At Discrimination Point1

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2002

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“…For easy comparison of characteristics due to noise power spectra, we find the eye pattern by using η = η c , η opt . The outermost positive signal levels are taken as l e and l opt , and the spectrum is normalized to (l e / l opt ) 2 [11]. Since l e and l opt have width due to equalization error, we take the middle value.…”

Section: Noise Power At Discrimination Pointmentioning

confidence: 99%

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Performance comparison of (1,7) RLL coded PRML systems and 16/17 (0,6/6) coded PRML systems in perpendicular magnetic recording using double‐layered media

Okamoto

Ashikaga

Saito

et al. 2002

Electron Comm Jpn Pt II

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SUMMARYThe performance of a partial response maximum likelihood (PRML) system in perpendicular magnetic recording that uses double-layered media perpendicular to the MR head is evaluated. The codes of (1,7) RLL and 16/17 (0,6/6), which are commonly used in modern hard disk equipment, are used as the recording codes. The relationship between the normalized linear density and the desired SNR at the reading point for a bit error rate of 10 4 is determined from a computer simulation, assuming equalization by a transversal filter, and a comparative study is performed. It is shown that a (1,7) RLL coded PRML system has better performance when the recording density is comparatively low. For high recording density, a 16/17 (0,6/6) coded PRML system has shown better performance.

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Section: Noise Power At Discrimination Pointmentioning

confidence: 99%

“…The authors have already proposed an efficient PRML system that realizes high-density recording by combining the MR head with perpendicular double-layered media [10,11].…”

Section: Introductionmentioning

confidence: 99%