Need My Book Essential Drive - 2TB to work on both Windows and Mac


I just bought a WD 2TB hard drive and it seems like it only work on Windows.  I notice there’s WDSmartware program in the drive by default.  Is there a program from WDsmartware that format the hard drive to work on both windows and mac?  I’m getting the error when i try to copy a file from my iMac to the external hard drive.  Can some one please help?  I need it to work on both windows and mac.


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