How to encrypt an external hard drive in Windows and have it readable in Mac?

I have a 1TB external hard drive that I need to be able to use on both Windows and Mac computers. Additionally, I need to encrypt it with a password. How to encrypt this external hard drive? Any encryption software needed?

Using TrueCrypt is not secure as it may contain unfixed security issues. TrueCrypt official site suggests users to migrate from TrueCrypt to Bitlocker, so up to now, Bitlocker is the best and secure way to encrypt data.

Although Microsoft only released Bitlocker for Windows, but with the help of M3 Bitlocker Loader, Bitlocker encrypted USB drive can be easily readable in Mac computer.

How to Bitlocker encrypt USB drive in Windows?

To enable BitLocker drive encryption on a USB flash drive, do the following:

Step 1: Insert a USB flash drive to a Windows computer where installed Windows 10 Professional/Enterprise, Windows 8/8.1 Professional/Enterprise, Windows 7 Ultimate/Enterprise, Windows Vista Ultimate/Enterprise, Windows Server 2008/2012, only these Windows editions support Bitlocker drive encryption.

Step 2: Format USB drive into FAT32/NTFS/exFAT file system. If there is data in USB drive, please go to step 3.

Step 3: Right click USB drive in My Computer or This PC and select "Turn on Bitlocker".

Step 4: On the "Choose How You Want To Unlock This Drive" window, choose one or more for the following options, and then click Next:

"Use A Password To Unlock This Drive": Select this option if you want to be prompted for a password to unlock the drive. Passwords allow a drive to be unlocked in any location and to be shared with other people.

"Use My Smart Card To Unlock The Drive": Select this option if you want to use a smart card and enter the smart card PIN to unlock the drive. Because this feature requires a smart card reader, it is normally used to unlock a drive in the workplace and not for drives that might be used outside the workplace.

Step 5: On the "How Do You Want To Store Your Recovery Key" window, click Save The Recovery Key To A File.

Step 6: In the "Save BitLocker Recovery Key As" window, choose a storage location and then click Save.

Step 7: On the "Are You Ready To Encrypt This Drive" window, click Start Encrypting. Do not remove the USB drive until the encryption process is complete. How long the encryption process takes depends on the size of the drive and other factors.

How to read/access/open Bitlocker encrypted USB drive in Mac?

With the help of M3 Bitlocker Loader for Mac, we can easily access/read/mount/open Bitlocker encrypted USB drive in Mac computer. M3 Bitlocker Loader is a Bitlocker encrypted drive read-write tool for Mac computer, it can read/write Bitlocker encrypted external hard drive and USB flash drive in macOS 10.13 (High Sierra), 10.12 (Sierra)‎ and Mac OS X 10.11/10.10/10.9/10.8/10.7 Operating Systems.

Tutorial to open/access/read/mount Bitlocker encrypted USB drive on Mac

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

Step 2: Launch M3 Bitlocker Loader for Mac and insert a Bitlocker encrypted USB drive.

M3 Bitlocker Loader for Mac

Select Bitlocker encrypted USB drive and then click "Unlock/Open" icon to continue.

Step 3: Enter the password (or 48-digit recovery key) to open/mount Bitlocker encrypted USB drive.

Open/Mount Bitlocker encrypted USB drive on Mac

Step 4: Read Bitlocker encrypted USB drive on Mac computer.

Read Bitlocker encrypted USB drive on Mac

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