Then, I tried Disk Management but only received “The format did not complete successfully”. But I only got “Windows was unable to complete the format” when I tried to format it from Windows Explorer. “Having a 1TB WD Passport external hard drive with RAW file system, I want to format it to exFAT for using in Mac and Windows computer. Unable to format WD Passport external hard drive Clean WD hard drive and create new partition Remove write protection from WD external hard drive Unable to format WD Passport external hard drive.