I can't eject my disk from USB Superdrive that is connected to my Macbook Pro.

Five ways to eject a stuck CD or DVD from the optical drive

1. Restart the computer and after the chime press and hold down the left mouse button until the disc ejects.
2. Press the Eject button on your keyboard.
3. Click on the Eject button in the menubar.
4. Press COMMAND-E.
5. If none of the above work try this:

Open the Terminal application in your Utilities folder. At the prompt enter or paste the following:

/usr/bin/drutil eject

then press RETURN.

If this fails then try this: Boot the computer into Single-user Mode. At the prompt enter the same command as used above. To restart the computer enter "reboot" at the prompt without quotes.

Try these:

How do I eject a defective DVD?

How force eject disc

When you try to eject lift the SuperDrive so that the slot is pointing down and shake it a little.

If you look in the slow do you see a disk?