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Note: If you do not see the “Encryption” option in the drop-down menu, your USB flash drive has not been formatted using the GUID partition map. This tool encrypts the data on the removable drive to provide higher data security.Ĭonnect the USB flash drive to your Mac and find its disk icon on the desktop or Finder sidebar, then right-click and select Encrypt “” from the context menu.

Its function is similar to BitLocker To Go on the Windows operating system. The contents of the disk will be encrypted, and without the password, no one can access them. How to encrypt a USB/external hard drive in Finder optionįinder uses XTS-AES encryption, allowing you to encrypt USB disks without erasing data.

Click the link below to get a step-by-step guide on how to do that: You can encrypt an external hard drive on Mac without erasing using the Disk Utility or Finder options. See Protect your Mac information with encryption.We’ll show you how to use Mac’s internal encryption program to encrypt a USB flash drive without losing data. You can also encrypt a disk and protect it with a password without erasing it. You can encrypt your data without erasing it by turning on FileVault in Privacy & Security settings (see Encrypt Mac data with FileVault).

If the Security Options button is not available, you can’t use Disk Utility to perform a secure erase on the storage device. Secure erase options are available only for some types of storage devices. (Optional) If available, click Security Options, use the slider to choose how many times to write over the erased data, then click OK. To change the password later, select the volume in the sidebar, then choose File > Change Password. In the sidebar, select the storage device you want to encrypt.Ĭlick the Scheme pop-up menu, then choose GUID Partition Map.Ĭlick the Format pop-up menu, then choose an encrypted file system format.Įnter and verify a password, then click Choose.

If Disk Utility isn’t open, click the Launchpad icon in the Dock, type Disk Utility in the Search field, then click the Disk Utility icon. In the Disk Utility app on your Mac, choose View > Show All Devices. If the device contains any files you want to save, copy them to another storage device or volume.