| ERROR | Block, DBA number, already marked corrupt |
| CAUSE | The block was previously corrupted. It has been marked as corrupt by the Oracle database server. |
| ACTION | If the block is not currently allocated to a database object, then no action is required. If the block is allocated, then the options and required action depend on the type and nature of the object which owns the block. To repair an allocated block, perform block or file media recovery. |