If you do it as a “clean” install, then yes, all on that hard drive will be lost – including the keys for your previous BitLocker installation.

How to save a fresh copy of your BitLocker recovery key If you're running Windows 11 Pro, Windows prompts you to save the recovery key when you first turn on BitLocker encryption.

After reports of widespread flaws in hardware-based SSD encryption, Microsoft has pushed out an update that defaults BitLocker protection to software-based AES encryption.