Turn on, turn off the hard drive:
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Bios, Sound signal of a bios computer
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Turn on, turn off the hard drive
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Input error sound, Pressing a keypad
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Typewriter, environmental sounds, Office work
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Manual copy machine
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General noise, Office work
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CD / DVD drive, disc read
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Franking machine
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The USB flash drive is inserted, removed
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Laser printer
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Signal read information, Computer interface
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Old computer keyboard
★★★★★