For passive projects such as point-of-sale displays, video loopers, and your upcoming Halloween builds, Adafruit have come up with a read-only solution for powering down your Raspberry Pi without endangering your SD card. Pulling the plug At home, at a coding club, or at a Jam, you rarely need to pull the plug on your Raspberry Pi without going through the correct shutdown procedure. To ensure a long life for your SD card and its contents, you should always turn off you Pi by selecting the shutdown option from the menu

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Adafruit’s read-only Raspberry Pi