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How does `mt eom work when youve started overwriting a tape in the middle?

middle overwriting STARTED tape
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How does `mt eom work when youve started overwriting a tape in the middle?

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(EOM is “End Of recorded Media”, the position right after all data already recorded to the tape) One cannot use tape “files” like files on an ordinary file system. In principle, a tape doesn’t allow anything but appending new data at EOM. However, if one positiones just in the middle of the already recorded data AND starts writing, then the driver first deletes all following files (thus moving the EOM to the actual position) and then starts writing. Thus, the new EOM after finishing the write process, is then after the newly recorded data. One of the consequences of the above is, of course, that writing to the tape in the middle of the already recorded area, is destructive in the sense, that it not only overwrites the “file” the tape is positioned at, but also deletes all following files.

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