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The green activity LED blinks on both read and write activity on the SD card. On newer models it is connected to a GPIO expander , which is connected via I²C to the SoC.

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The green led (ACT) on my Raspberry Pi 3 is set to mmc0 to flash on SD card activity via echo mmc0 |sudo tee /sys/class/leds/led0/trigger However, it flashes much more often (randomly every few sec …
asked Feb 12 '17 by Frank Breitling