volume recording density

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• Perpendicular recording — (or Perpendicular Magnetic Recording, PMR) is a technology for data recording on hard disks. It was first proven advantageous in 1976 by Shun ichi Iwasaki, then professor of the Tohoku University in Japan, and first commercially implemented in… …   Wikipedia

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• History of sound recording — Methods and media for sound recording are varied and have undergone significant changes between the first time sound was actually recorded for later playback until now. Technology Mechanical recording The first devices for recording sound were… …   Wikipedia

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• Rock — /rok/, n. a male given name. * * * I In geology, a naturally occurring and coherent aggregate of minerals. The three major classes of rock igneous, sedimentary, and metamorphic are based on the processes that formed them. These three classes are… …   Universalium

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