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And a computer itself can act as a microphone: In a 2019 study researchers developed software that detected and analyzed how ambient sound waves jiggled a hard drive’s read head over its magnetic disk—and could thus effectively record conversations taking place near the machine.—Sophie Bushwick, Scientific American, 6 Oct. 2021 At the time of the broadcast, magnetic disk recorders capable of storing slow motion footage could only capture 30 seconds in total, for a playback of 90 seconds of slow motion video.—Howard Berry, Quartz, 18 July 2019 Shrunken Grains: Five years ago, the smallest grains on a magnetic disk measured 9.5 nanometers (nm) in diameter (left).—IEEE Spectrum, 5 Jan. 2019 To do this, the good frame was recorded onto a magnetic disk then replayed five times.—Amy Shira Teitel, Discover Magazine, 7 Sep. 2017
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