Hi Ahmad Shahwar,
If you did not enable BitLocker on your D drive, it's possible that it was enabled by default by your device manufacturer. However, unfortunately, the recovery key is the only way to unlock the drive and access the data.
To retrieve your recovery key, you will need to follow the steps in Finding your BitLocker recovery key in Windows - Microsoft Support.
Important:
- If you are unable to locate the BitLocker recovery key and can't revert any configuration change that might have caused it to be required, you’ll need to reset your device using one of the Windows recovery options. Resetting your device will remove all of your files.
- Microsoft support is unable to provide, or recreate, a lost BitLocker recovery key.
Good luck.
Best regards,
Lei