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Oracle requires you to use a tape library program to write on tape, you do not write on tape directly.
The tape library program should know where a tape is, and how it can be loaded, ideally there is a tape robot, which loads your tape.
Also, the tape library program should know when to request a new tape.
Even after 274 posts you have managed to post a question without any details:
no four digit Oracle version, no information about your OS, no information about the tape manager you use.
A more specific answer therefore is impossible.
Senior Oracle DBA