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Next to “Format:” click the contextual menu and select “Mac OS Extended (Journaled)”.Click on the “Erase” tab across the top.Locate the drive name from the left hand side of Disk Utility and click on it.Launch Disk Utility, located in Applications > Utilities.Connect the hard drive or USB key to the Mac.Formatting a drive will erase all data and partitions on the disk: This is a simple procedure and is achieved the same way for all drive types and through all connections, be they USB, Firewire, or Thunderbolt. How to Format an External Drive for Mac Compatibility If you have never formatted a drive before on the Mac, don’t worry, it’s super easy and we’ll walk you through the entire process.
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