Turn on, turn off the hard drive:
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Write, read, Hard disk, room noise
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Laser printer
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Signal read information, Computer interface
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Double click computer mouse
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Turn off the old computer, Turn on
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Fan noise, shutting, Turning on the laptop
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Opening, closing the laptop cover
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Computer keyboard
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Manual copy machine
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Removed, The USB flash drive is inserted
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Sound signal of a bios computer, bios
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Franking machine
★★★★★