– If the SD card is installed and the system boot path or configuration file path points to the SD card, the system boot path or configuration file path is saved to the SD card If the system boots from an SD card and you run a boot command, the following behavior applies: ■ boot command-Lets you change the system boot parameters.
If the system boots from the internal flash memory and you then insert an SD card and run the write command, the system saves the running configuration to the internal flash memory.