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I met the problem on Leopard again. Today when I tried to ejected my SD card reader, I saw the error message

The disk SDStorage is in use and could not be ejected. 
Try quitting applications and try again.

( SDstorage is my SD card label. )

I had no idea which application was using the card reader. After quitting most of my applications, the error popped whenever I tried to eject the disk. Then I found how to eject it by force, here is how:Read more >>