How to password protect an external hard drive so that it works on both Mac and Windows PC?
As far as we know, there are many cross platform encryption solutions (such as TrueCrypt), but BitLocker is more secure than other drive encryption software. Although Microsoft just developed and released Bitlocker for Windows and there's no Mac implementation, but with help of M3 Bitlocker Loader for Mac, Bitlocker password protected external hard drive can be readable in Mac.
How to encrypt/password protect external hard drive with Bitlocker in Windows PC?
Step 1: Insert external hard drive to a Windows computer.
Windows 10 Professional/Enterprise, Windows 8/8.1 Professional/Enterprise, Windows 7 Ultimate/Enterprise, Windows Vista Ultimate/Enterprise, Windows Server 2008/2012 are available for Bitlocker drive encryption.
Step 2: Format external hard drive into FAT32/NTFS/exFAT file system. If there is data in external hard drive, please go to step 3.
Step 3: Right click external hard 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 "Use A Password To Unlock This Drive" option and then click Next.
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.
How to read/write Bitlocker password protected external hard drive in Mac?
M3 Bitlocker Loader for Mac is a handy tool which can read/write Bitlocker password protected external drives (including external hard drive, USB drive, flash drive, memory stick, thumbdrive, SD card, etc.) in macOS High Sierra 10.13/10.12/10.11/10.10/10.9/10.8/10.7 Operating Systems.
Tutorial to read/write Bitlocker password protected external hard drive in Mac
Step 1: Download, install and launch M3 Bitlocker Loader for Mac on your Mac computer.
Step 2: Insert a Bitlocker password protected external hard drive and then click "Unlock/Open" icon to continue.
Step 3: Enter the password (or 48-digit recovery key) to unlock Bitlocker password protected external hard drive.
Step 4: After Bitlocker protected external hard drive is unlocked and mounted in read-write mode, we can copy, delete, transfer, edit files from Bitlocker encrypted external hard drive.