Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
MyBookLive:~# echo red > /sys/class/leds/a3g_led/color
MyBookLive:~# echo yellow > /sys/class/leds/a3g_led/color
MyBookLive:~# echo blue > /sys/class/leds/a3g_led/color
MyBookLive:~# echo green > /sys/class/leds/a3g_led/color
MyBookLive:~#
Also is possible use WHITE but this color light like magenta or pink color
echo white > /sys/class/leds/a3g_led/color
This command will start led light blinking.
MyBookLive:~# echo yes > /sys/class/leds/a3g_led/blink
This command will stop led light blinking.
MyBookLive:~# echo no > /sys/class/leds/a3g_led/blink