Arduino: format SD card
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Linux: With a SD card inserted, open a terminal window. At the prompt, type df, and press enter. The windows will report the device name of your SD card, it should look something like /dev/sdb1. Unmount the SD card, but leave it in the computer. Type sudo
mkdosfs -F 16 /dev/sdb1
replacing the device name with yours. Remove the SD card and replace it to verify it works.