“Must I reformat the WD-My Book 4TB USB 3.0 hard drive to operate with Catalina 10.15.6?”

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• Hi JACK, Yes, the WD My Book drive comes pre-formatted for Windows computer. 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 Need Help? Please see our "'Contact Us" page for information.

  Answered by Western Digital Team 5 years ago

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