CD / DVD drive, disc read:
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Computer noise, Communication room
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Floppy disk reading
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Read the, Insert the disk into the drive
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Turning on the computer, shutting, fan noise
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Laser printer
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Removed, The USB flash drive is inserted
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Computer interface, signal read information
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Matrix printer
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Double click computer mouse
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Computer interface, signals
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Turn on, turn off the old computer
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Interference, signal, Modem connection
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