Follow this procedure:
1. Insert the CF card into the card reader or the Leaf Aptus digital camera back.
2. On the desktop, double-click the system disk.
3. Select Applications > Utilities > Disk Utility.
4. On the left panel of the Disk Utility dialog box, select the removable disk that you want to format.
5. Click the Erase tab.
6. In the Volume Format box, select MS-DOS File System.
7. In the Name box, type LEAF-CF.
8. Click Erase.
9. In the confirmation message that appears, click Erase. Formatting is complete when the progress bar disappears from view, the Volume Format box shows Mac OS Extended (journaled), and the Name box shows Untitled.
10. On the desktop, select the LEAF-CF volume.
11. Select File > Get Info.
12. In the Leaf-CF Info window, ensure that Format shows Macintosh PC Exchange (MS-DOS).
13. Close the Disk Utility application.
14. Drag the LEAF-CF volume to Trash.