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Be aware that formatting a drive deletes all of the files on it, so back up anything important before completing this step. Click the Erase button and the drive will start formatting.
MAC INTERNAL HARD DRIVE FORMAT MAC OS
Select the format – Mac OS Extended (HFS+), MS-DOS (FAT32), or exFAT – then name the drive.
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Any Mac running 10.6.5 (Snow Leopard) or 10.7 (Lion) supports exFAT, while PCs running Windows XP SP3, Windows Vista SP1, and Windows 7 are compatible. Awesome, it’s perfect! Almost… since exFAT is fairly new, it isn’t compatible with older Macs and PCs. The exFAT file system eliminates the two major deficiencies of FAT32: the largest partition and file sizes it supports are virtually unlimited by today’s standards. Want to use one external drive for both your Windows PC and your Mac? One hurdle you'll.