A:Answer Hi VVvvbbbb, Please be informed that the WD My Passport external portable drive comes preformatted in NTFS format for Windows OS, However, you can reformat the drive with macOS supported HFS+J file system or both macOS and Windows supported exFAT file system by using this link: "Reformatting Required for Mac OS Compatibility" https://support-en.wd.com/app/answers/detail/a_id/3879 -Need Help? Please see our "'Contact Us" page for information.