 Disk First Aid is a very simple tool, with it only being able to detect and repair directory damage and many books are critical of its sometimes inaccurate reporting of errors, and often suggest to run the tool more than once to ensure you are receiving a consistent result.Disk First Aid is located in codice_1.The classic Mac OS provides an option to run Disk First Aid on startup, although it has been reported that it provides little gain and sometimes can amplify a problem.