[Solved] How to encrypt USB flash drive and external hard drive with Bitlocker on Mac?

Preconditions for using Bitlocker drive encryption on Mac

1. Prepare for an external drive, such as USB drive, flash drive, external hard drive.

2. The file system of the external drive must be NTFS, FAT32 or exFAT.

3. Bitlocker drive encryption requires macOS 10.10 and above OS.

Tutorial to encrypt USB flash drive with Bitlocker in macOS & Mac OS X.

Step 1: Download and install M3 Bitlocker Loader for Mac.

Step 2: Insert an external drive (such as external hard drive, USB drive, flash drive) into Mac computer.

Step 3: Launch M3 Bitlocker Loader for Mac.

Step 4: Click "Encrypt" button in toolbar.

M3 Bitlocker Loader for Mac

Step 5: Select the partition which you want to encrypt and click Encrypt.

Encrypt drive with M3 Bitlocker Loader for Mac

Step 6: Enter the password.

Step 7: Save the recovery key.

Step 8: Complete Bitlocker drive encryption.

After encrypting external drive with Bitlocker on Mac, you can use M3 Bitlocker Loader for Mac to read/write Bitlocker encrypted drive on Mac Mini, Mac Pro, MacBook, MacBook Pro, MacBook Air, iMac with macOS Mojave 10.14/High Sierra 10.13/10.12 (Sierra)‎ and Mac OS X 10.11/10.10/10.9/10.8/10.7 Operating Systems.

Notes: M3 Bitlocker Loader for Mac requires a healthy Bitlocker encrypted drive. If your Bitlocker encrypted drive is corrupted, please try Bitlocker data recovery software: M3 Bitlocker Recovery in Windows to recover data from corrutped Bitlocker encrypted drive.

Tutorial to open and read/write Bitlocker encrypted USB drive on Mac computer

Step 1: Download, install and launch M3 Bitlocker Loader for Mac on your Mac computer.

Step 2: Insert a Bitlocker encrypted USB drive.

M3 Bitlocker Loader for Mac

Step 3: Select Bitlocker encrypted USB drive you want to open on Mac computer and then click "Open" icon to continue.

Open and read Bitlocker encrypted USB drive on Mac

Step 4: Enter the password (or 48-digit recovery key) and click "Unlock" to unlock Bitlocker encrypted USB drive.

Open and read Bitlocker encrypted USB drive on Mac

Step 5: Select the files in Bitlocker encrypted USB drive you and then copy them out.

Open and read Bitlocker encrypted USB drive on Mac

Bitlocker for Windows Home

M3 Bitlocker Loader for Windows is a free encryption software to create an encrypted container which is compatible with Bitlocker Drive Encryption so that the USB flash drive or external hard drive is protected by Bitlocker in Windows 10/8/7 Home and Windows 7 Professional.

Bitlocker for Linux/Ubuntu

M3 Bitlocker Loader for Linux is a command line tool to encrypt USB flash drive or external hard drive with Bitlocker, mount Bitlocker encrypted drive in read-write mode.