Hello Majed,
BitLocker keys are not stored on the hard disk itself, so there is no way to create a new key for an already-encrypted drive. To unlock it you need to find an existing recovery key, or you will have to erase the drive and lose the data.
Here are the main places you can check for the BitLocker recovery key:
If this drive was used in a Windows 10/11 PC with a Microsoft account, sign in to https://aka.ms/myrecoverykey and see if the key is saved there.
If it belonged to a work or school device, contact your IT administrator - they may have the key in Azure AD / Entra ID or Active Directory.
- Look for a paper printout, a text file on a USB stick, or a photo/screenshot where you might have saved the key earlier.
If you still cannot find any recovery key from these places, the encrypted data cannot be recovered. In that case you can only clean the disk (delete all partitions and reformat it) and then use it again as a new drive.
Regards,
Finn.