Use the BADTRACK statement to identify defective tracks on a spool volume. JES3 dynamically adds an entry to the BADTRACK table when a defective track is discovered and issues a message to the console operator that identifies the defective track. If possible, add a BADTRACK statement to your initialization stream at that time so that JES3 keeps a record of the defective track across a warm or cold start. If you cannot add a BADTRACK statement immediately, ensure that you add a BADTRACK statement before the next warm or cold start.