How to solve "Bitlocker drive parameter incorrect, unknown file system" issue?

I have Bitlocker encrypted 1TB external hard drive, today, when I tried to open it, an error box appeared saying "Drive is not accessible, parameter is incorrect".

I right clicked and checked 'properties' of this Bitlocker encrypted external drive. It showed me Used Space = 0 bytes and Free Space = 0 bytes, file system as 'Unknown (Bitlocker encrypted). How should I access the data stored in it?

Bitlocker drive parameter is incorrect, unknown file system

In this situation, the file system of Bitlocker encrypted drive is corrupted so that Windows is unable to recognize it and showing unknown file system. It is usually caused by unexpected power failure, improper ejection, file system corruption, virus attack, system crash, Windows update, etc.

When Bitlocker drive is not accessible, the data stored in it cannot be accessible either. We have to format it so that we can access the drive, but the data will be lost once we format inaccessible Bitlocker encrypted partition, so we must recover data firstly before formatting it. How to recover data from inaccessible Bitlocker encrypted drive?

M3 Bitlocker Recovery is a professional Bitlocker data recovery software that can recover data from inaccessible Bitlocker encrypted drive, recover data from formatted Bitlocker encrypted partition, recover data from deleted or lost Bitlocker partition, recover data from failing Bitlocker encrypted drive, recover data from RAW Bitlocker encrypted drive, recover data after Bitlocker encryption/decryption failed, etc.

Tutorial to recover data from inaccessible Bitlocker encrypted drive

1. Download, install and launch M3 Bitlocker Recovery on your computer.

2. Select the inaccessible Bitlocker encrypted partition you want to recover data from and then click Next.

Professional Bitlocker encrypted drive data recovery software

3. Enter the password or 48-digit recovery key.

Enter password to decrypt data from inaccessible Bitlocker encrypted partition

4. M3 Bitlocker Recovery is scanning the data from inaccessible Bitlocker encrypted partition.

Recover data from inaccessible Bitlocker encrypted partition

5. After the data is found from inaccessible Bitlocker encrypted partition, please select them and click "Recover" to start recovery.

Step 2: Fix "Bitlocker drive parameter incorrect, unknown file system" error by reformatting

After data recovery from inaccessible Bitlocker encrypted partition, we can fix "Bitlocker drive parameter incorrect, unknown file system" error by reformatting:

1. Right click inaccessible Bitlocker encrypted partition in My Computer (This PC) or Disk Management.

2. Select "Format..." from right-click menu.

3. Enter the related information about format.

4. Click Start button to format inaccessible Bitlocker encrypted partition, the inaccessible Bitlocker encrypted partition will be working again after format completes.