BitLockeris only available on Professional, Enterprise, and Ultimate editions of Windows. BitLocker can also be used with a VHD file, creating an encrypted container file that contains encypted files. BitLocker To Go can encrypt a USB flash drive or another external media device. BitLocker drive encryptio ncan encrypt your entire Windows system drive or another internal drive. Windows has built-in BitLocker encryption. RELATED: What Is Encryption, and How Does It Work?