The Repair-bde command-line tool cannot repair a drive that failed during the encryption or decryption process.The following limitations exist for Repair-bde: The contents of the output volume will be completely deleted and overwritten by the decrypted contents of the damaged BitLocker drive. You will need to have an empty output volume (drive) of equal or larger size than the damaged BitLocker encrypted drive.

To recover a damaged OS drive with the BitLocker Repair Tool, the OS drive will need to be connected to another PC if you are not multi-booting with another Windows on the same PC to run the BitLocker Repair Tool from. Repair-bde can reconstruct critical parts of the drive and salvage recoverable data as long as a valid BitLocker password, recovery key, or startup key (.BEK file) is used to decrypt the data. The BitLocker Repair Tool (Repair-bde) can be used to access encrypted data on a severely damaged hard disk if the drive was encrypted by using BitLocker. This kind of problem may be caused by a hard disk failure or if Windows exits unexpectedly.

You may experience a problem that damages an area of a hard disk on which BitLocker stores critical information, and can no longer unlock the OS drive, fixed drive, or removable drive normally. When you turn on BitLocker for an OS drive, you can choose to unlock the drive at startup with a password, USB flash drive, PIN (with TPM), or automatically unlock. When you turn on BitLocker for a removable data drive, you can choose to unlock the drive using a password, smart card, or automatically unlock when connected. If you turned on BitLocker for the OS drive, then you could also choose to automatically unlock a fixed data drive when you sign in to Windows. When you turn on BitLocker for a fixed data drive, you can choose to unlock the drive using a password or smart card. How to Use BitLocker Repair Tool to Recover Encrypted Drive in Windows

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