Just purchased USB SuperDrive to connect MacBook air can't eject start up disc

just purchased USB SuperDrive to connect MacBook air can't eject start up disc? please advise

No, of course not. The "startup disk" is the disk with your boot volume (operating system) on it. Once you boot (startup) from it it is locked as your computer will not "run" without a valid "startup disk".
It would be similar to complaining that "I can't remove the engine from a running vehicle".

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