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垂直磁気記録方式
Wikipedia definition
1. Perpendicular recordingPerpendicular 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 2005.
Read “Perpendicular recording” on English Wikipedia
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