Design Tradeoffs For Beyond 20 Gb/In.(2): Using A Merged Notched Head On Advanced Low Noise Media (Invited)
JOURNAL OF APPLIED PHYSICS(2000)
摘要
Design considerations for areal densities beyond 20 Gb/in.(2) are discussed, and in particular a demonstration at 24.8 Gb/in.(2) is shown. The demonstrations used a single combined write and read head (Merge, Notched head). In this article we will discuss the tradeoffs in kilobytes per inch (KBPI) and tracks-per-inch in obtaining areal densities at 25 Gb/in.(2) densities. The KBPI is limited by both the total signal-to-noise ratio and the nonlinear-transition shift. Simple estimates of the increase in channel performance from class IV partial response (PR4), extended partial response 4 (EPR4), and modified EEPR4, as well as the addition of codes which eliminate bit shift and tribit errors are discussed as large contributors to the increase in the areal density. (C) 2000 American Institute of Physics. [S0021-8979(00)92708-7].
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关键词
signal to noise ratio
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