Why are ou doing that if you are going to nuse it exclusively on a Mac? NTFS is read only for Macs. If you wish to use the drive for both OS X and Windows lash out $20 on Paragon software:-
Shop for your Apple, Mac, iPhone and other computer products on Amazon.
We are a participant in the Amazon Services LLC Associates Program, an affiliate program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.