A hard fault is a persistent corruption of SAP ASE that cannot be corrected by restarting SAP ASE.
A page that is allocated to a nonexistent table minimally reduces the available disk storage.
A table with some rows that are unreachable by a scan might return the wrong results.
A table that is linked to another table causes the query to stop.
Some hard faults can be corrected by simple actions such as truncating the affected table. Others can be corrected only by restoring the database from a backup.