Automatic unlocking for fixed data drives requires the operating system drive to also be protected by BitLocker. If a computer is being used that doesn't have a BitLocker-protected operating system drive, then the fixed drive can't be automatically unlocked. For removable data drives, automatic unlocking can be added by right-clicking the drive in Windows Explorer and selecting Manage BitLocker. Password or smart card credentials that were supplied when BitLocker was turned on can still be used to unlock the removable drive on other computers.