I have an external HDD protected with BitLocker that contains important files. My Windows installation is on a separate NVMe SSD, and I had been unlocking the HDD about once a week with the same password without any issues. Now BitLocker reports that the password is incorrect, even though I'm confident I'm entering the one that previously worked. I did not intentionally change the password, and I cannot find a saved 48-digit recovery key. Some codes I found appear to be identifiers or GUIDs rather than the recovery key itself. I also manually deleted a file from the NVMe that may have contained recovery information, and it is no longer in the Recycle Bin. The external drive has not been formatted or initialized, and I want to avoid any operation that could alter it. What can I safely check to confirm the password is being entered correctly, inspect BitLocker metadata, or determine whether another issue is involved? Would trying the drive on another Windows computer help? If the recovery key was stored on the NVMe, what are the safest ways to search for or recover it without writing new data to that SSD? The files are important, so preserving the encrypted data is more important than experimenting with risky recovery tools.
3 Answers
Avoid formatting, initializing, repairing, or repeatedly experimenting with the HDD. BitLocker normally does not randomly forget a valid password, so double-check the keyboard layout, Caps Lock, Num Lock, punctuation, and whether the password was originally created with a different keyboard layout. Trying the drive on another Windows PC with a known-good USB cable or enclosure is a reasonable, low-risk diagnostic step, but it will not bypass BitLocker or recover a missing key.
The first thing to check is whether the recovery key was backed up to your Microsoft account. From another device, sign in to the account that was used with Windows and look for the BitLocker recovery keys. Match the recovery-key ID shown on the locked drive with the ID listed online. A GUID or identifier by itself is not the 48-digit key, but it may help you identify the correct entry.
I’ve already spent several hours checking the information I have, but I haven’t found a working recovery key yet. I’ll compare the recovery-key ID carefully rather than relying on the other codes.
For important data, stop attempting recovery commands until you have a plan. BitLocker metadata inspection can sometimes be performed read-only, but the wrong tool or repair option could modify the disk. If the password and recovery key cannot be found, contact a reputable data-recovery specialist and explain that the drive is BitLocker-encrypted; they can usually image the media first and work from the image. For the deleted key file on the NVMe, avoid installing recovery software or saving files there, since that can overwrite recoverable data. Shut the computer down and have the SSD examined from another system or by a professional, preferably after making a forensic image.
Because the drive is locked, a normal file backup is not possible yet. The safest backup is a sector-by-sector image or clone made before recovery work, ideally by a professional using a write-blocked workflow.