Data Logging with SD Cards - Exploring Arduino: Tools and Techniques for Engineering Wizardry - page 282

4. Click the Start button to format the SD card.
On a Mac, the process is similarly straightforward:
1. Use the Finder to locate and open the Disk Utility application.
2. Click on the SD card in the left panel, and click on the Erase tab. Choose
MS-DOS(FAT) for the format.
3. Click Erase. This will format the card as FAT16 regardless of its capacity.
(Macs cannot natively format cards as FAT32.)
On Linux, you can format the card from the terminal. Most Linux distros
will mount the card automatically when you insert it:
1. Insert the card, and a window should pop up showing the card.
2. Open a terminal, and type in df to get a list of the mounted media. The
result should look like Figure 13-4.
The last entry should be your SD card. On my system, it was mounted as
/dev/mmcblk0p1 , but on yours might differ.
Figure 13-4: Linux df command
3. Unmount the card before you format it by using the umount command.
The argument will be the name of your SD card (see Figure 13-5).