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I have a 3TB USB3 drive that I want to use between my Mac and Windows laptops. A 1.5TB partition will be used for Time Machine and another 1.5TB partition will be used by Windows for file storage. The Windows partition will be ex-FAT because I want the files to be read/write able from both machines. The drive will be swapped between the two machines periodically.

On what OS should I create the two partitions so that it's usable by both OSes? I started by creating partitions in Windows. The Mac can see the Windows partition but when I try to format the parition for Time Machine, Disk Utility says:

Volume Erase failed with the error: MediaKit reports not enough space on device for requested operation.

Help.

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I would strongly suggest partitioning the drive from your Mac. Most likely the partition you created in Windows is not in a format that Mac is expecting. –  tubedogg Aug 24 '13 at 3:22
    
Learned that the hard way. I repartitioned on the Mac and now it works as expected on Mac and Windows. –  Sajee Aug 30 '13 at 2:36

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