GPIO Led power on or Hard Disk?

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Hello everyone , you can use the GPIO pins to get two LEDs, like a pc? one for the HD, and other to power on? and use them to put a power button and a reset ?

I use a housing ps3, and I would like to take this opportunity to do well.

To drive a LED : http://destroyedlolo.info/BananaPI/Led/ (in French, use an online translator)
To make the LED blinking as per disk activities : http://destroyedlolo.info/Developpement/BananaLEDd/

Thanks so much

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