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Hi nellka, These drives are pre-formatted for windows OS.The hard drive can be reformatted in the supported file system for Mac OS by following simple steps mentioned in the link mentioned below: Reformatting Required for Mac OS Compatibility: https://support-en.wd.com/app/answers/detail/a_id/3879 "Starting macOS Time Machine Backups to My Passport and External USB Drives" https://support-en.wd.com/app/answers/detail/a_id/18952 Need Help? Please see our "'Contact Us" page for information
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