What should I do if the Win8 system forgets the BitLocker password?

First, let's take a look at using BitLocker Drive Encryption to help protect all files stored on Windows-installed drives (operating system drives) and fixed data drives (such as internal hard drives). Files remain encrypted only when they are stored on an encrypted drive. Files copied to other drives or computers will be decrypted. If you share files with other users (for example, over a network), they will remain encrypted when they are stored on an encrypted drive, but authorized users can usually access them. (The BitLocker To Go reader is used to unlock an encrypted drive on a computer running Windows Vista or Windows XP.)

Solution:

Decrypt using the recovery key, if the recovery key is also Lost, at least for a limited time, is unbreakable. Unfortunately, you can only reformat the disk partition.

Make sure that this recovery key is created the first time BitLocker is enabled; otherwise, you may permanently lose access to the file. If your computer has a Trusted Platform Module (TPM) chip, BitLocker will use it to seal the keys used to unlock the encrypted operating system drive. When you start your computer, BitLocker asks the TPM to provide the driver's key and unlock it. The following figure shows the key recovery process: