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How to format a drive on a Mac Here's how to format a drive using a Mac - including how to format a drive for Windows and Mac so the contents can be read on both platforms, and what format to use.
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. Existing Drive: If you're formatting a drive that you've been using and that has data on it, double-check in Explorer that the drive letter you're choosing here in Disk Management is the same as the one you see in Explorer that has the information on it that you want to erase. Once formatted, the existing data on the disk are probably unrecoverable for most people. New Drive: If you're formatting a new drive, a great way to tell that it's the right one is to look at the File System column in the top part of Disk Management. Your existing drives will show of or but a new, unformatted drive will show RAW instead.