Nonlinear Transition Shift in the Combination of Single-layered Perpendicular Recording Medium and Ring Head

Ito, K.; Hirayama, Yoshiyuki; Honda, Yukio; Futamoto, Masaaki

doi:10.3379/jmsjmag.21.s2_221

Cited by 2 publications

(2 citation statements)

References 14 publications

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“…The saturation test at 5400 RPM shows that all the media are saturated when the write current is over 16 mA. An overwrite test was also conducted at a different writing current ( kfci, kfci, 5400 RPM spindle speed), to assure the lower and steady NLTS for different types of disk media [5], [6]. The results will show that the overwrite is 40 dB or above, and is saturated when the write current is over 18 mA for all types of media under investigation.…”

Section: Media Specifications and Experimentsmentioning

confidence: 99%

Low NLTS approach: Perpendicular/Longitudinal composite media

et al. 2000

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It is desirable to employ low NLTS media in high density magnetic recording. The perpendicular/longitudinal (P/L) composite media, consisting of a perpendicularly oriented top layer and a longitudinally oriented underlayer, tends to have lower NLTS value than the single layered perpendicular media due to the opposite shift direction of NLTS in the two recording layers. Experimental results show that the P/L composite media has lower NLTS than single layered perpendicular media, and its NLTS value is slightly less sensitive to flying height or switching speed variation when comparing with single layered perpendicular media. Index Terms-Perpendicular/longitudinal (P/L) composite media, NLTS.

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Section: Media Specifications and Experimentsmentioning

confidence: 99%

Low NLTS approach: Perpendicular/Longitudinal composite media

et al. 2000

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“…Therefore, we must note that the nonlinear distortion in perpendicular magnetic recording (PMR) is small [4].…”

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confidence: 99%

PR5ML Processing for Perpendicular Magnetic Recording

Umemoto

1997

J. Magn. Soc. Jpn.

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-The partial response class 5 (PR5) signal processing for perpendicular magnetic recording with single layer media is discussed. Several benefits of the PR5 system to channel coding and Viterbi detection are shown: applicable to both the d=O code and the d=lcode, interleaving signal processing, and the four-state in the Viterbi decoder. Basic configurations of the timing recovery for the PR5 system is also shown.

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Nonlinear Transition Shift in the Combination of Single-layered Perpendicular Recording Medium and Ring Head

Cited by 2 publications

References 14 publications

Low NLTS approach: Perpendicular/Longitudinal composite media

Low NLTS approach: Perpendicular/Longitudinal composite media

PR5ML Processing for Perpendicular Magnetic Recording

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