Turn on, turn off the hard drive:
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Alarm, Computer interface
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Franking machine
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Modem connection, interference, signal
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Floppy disk reading
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CD / DVD drive, disc read
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Environmental sounds, Office work, typewriter
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Jet printer
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Signal read information, Computer interface
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Closes the CD / DVD tray, Opens, disc read
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Old computer keyboard
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Matrix printer
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Computer keyboard
★★★★★