Oracle : Ошибка ORA-19660

"some files in the backup set could not be verified"
*Cause: A restore conversation was made to verify all the files in a backup
set, and the files which were printed in messages 19661 or 19662
could not be verified because corrupt blocks for those files were
found in the backup set.
*Action: Unless the damage to the backup set can be repaired, the indicated
files cannot be restored from this backup set.

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