MS-DOS (FAT) allows you to use Windows volumes of 32 GB or less.ĮxFAT allows you to use Windows volumes over 32 GB Mac OS Extended (Case-sensitive, Journaled, Encrypted) adds password and encryption protection to the partition while also including Mac formatting with case sensitive folder names. ('Backup' and 'backup' will be two different files.) Mac OS Extended (Case-sensitive, Journaled) makes case-sensitive folders and Mac format. Mac OS Extended (Journaled, Encrypted) adds a password and partition encryption to the Mac format. Mac OS Extended (Journaled) uses Mac formatting to protect data integrity A Format pop-up window will give you the opportunity to choose one of the following:.Click 'Erase' from the Disk Utility options.Find your external hard drive in the list of drives.Open Applications > Utilities > Disk Utility.Since most external hard drives are formatted for PCs, before the backup of your Mac begins you need to format the hard drive for macOS. Copying the files from your Mac to an external drive allows you to save data on your own terms.

External storage imac