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Same question I asked before purchasing it. Since it is a WD-my Passport for Mac it didn’t need formatting. I also have Sierra and it works just fine.
Sorry, there was a problem. Please try again later.Hi Maurine, Please be informed that the WD My Passport for Mac drive is a plug and play device that comes ready for macOS out of the box. To know more about the drive refer the below link- http://products.wdc.com/library/AAG/ENG/4078-705156.pdf Need Help? Please see our "'Contact Us" page for information.
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