This issue has been occasionally reported to occur on PowerBooks. You should first make sure you do not have a RAM disk turned on in the memory control panel. To remove the extra floppy icon, you must reset your parameter ram using the following procedure:
1. Restart your computer.
2. After you hear the startup chime hold down the Command, Option, P, and R keys on the keyboard.
3. Continue holding these keys down until you hear a second startup chime.
When you restart with the Disk Tools disk and run Disk First Aid, the extra floppy will be gone.
This article was published in the "Information Alley":
Volume II, Issue 8, Page 19