Only proceed if you are certain that you have correctly identified your USB drive! Use whatever diskn number corresponds to your target drive, where n is an integer. ![]() My system showed a subsequent entry disk2s1 but note how this still refers to disk2. ![]() The “IDENTIFIER” for my USB drive, found at the top of the list, was disk2. Look for an entry (or entries) like /dev/disk2 (external, physical) and make absolutely sure that you understand the difference between your system’s hard disk and the external USB drive you want to encrypt. Use the following command to list your disks: diskutil list Instructionsįirst, plug your USB drive into your computer and open the Terminal app. ![]() This post covers how to format a USB drive to either the JHFS+ or the new APFS filesystem and encrypt it using the Terminal and Disk Utility. MacOS Sierra doesn’t feature an option to encrypt a USB drive in Disk Utility or in Finder (at least at the time of writing).
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