Database optimization and rebuild index failed with error indicating transaction log is full. When attempting to increase the database transaction log file, I got message: 'Error 5149: modify file encountered operating system error 1392(file or directory is corrupted and unreadable) while attempting to expand the physical file' . But, I was able to do database and transaction log backups. What should I do to enable me to expand its transaction log without errors ? Any suggestion is appreciated. Thanks