Write the image to both the USB storage device and an SD card. IE, write the image using xzcat file.xz > /dev/sdX then xzcat file.xz > /dev/mmcblkX. | Write the image to both the USB storage device and an SD card. IE, write the image using xzcat file.xz > /dev/sdX then xzcat file.xz > /dev/mmcblkX. |