Turn on, turn off the hard drive:
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Read the, Insert the disk into the drive
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General noise, Office work
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Photocopy (photocopy)
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Hard disk, write, room noise, read
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Computer keyboard
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Matrix printer
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Fan noise, shutting, Turning on the laptop
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Franking machine
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Signal read information, Computer interface
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Floppy disk reading
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Opens, closes the CD / DVD tray
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Jet printer
★★★★★