Format Mac OS Partition WD my Passport MAC OS Passport WD can't save files. How to Format to change this. Open Launch Pad or click "Go" from Finder, click on Utility, then go to disk utility, click on 3 TB WD PASSPORT (or whatever your is) in the center click the word "Partition" (if you don't see the word Partition you click the wrong one one the left) next in the drop box click "1 partition" , on the right re name your Hard Drive to what ever you want. , the click drop down box and click "Mac OS extended journaled " on the bottom click "options " then select " GUID Partition Table" press ok and double check everything. Once done click "Apply" on the bottom right takes a minute or two. Once down close all that out and your hard drive should now have all permission to do what's you want.

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