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It will remove all errors by writing a new file system on the external hard drive and prepare it as a new and blank disk for use.īefore handling the formatting, you need to make sure you have adequate backups of important files. When the external hard drive has been badly corrupted, formatting will be the last fix. If you see the messages telling you that the First Aid failed, the external hard drive is too corrupted to be fixed by First Aid.įix a corrupted external hard drive by formatting Click on the First Aid button, or right-click the external hard drive and choose First Aid from the options.Select the external hard drive at the left side.Open Disk Utility through Finder and Applications.In this case, you can use it to repair the corrupted external hard disk. Run First Aid to repair the software errorsĭo you know First Aid? It is a small utility in Disk Utility for checking and repairing the minor logic errors on a disk.