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You use BitLocker Drive Encryption to encrypt non-operating-system volumes on a Windows Vista Service Pack 1 (SP1)-based computer. Then, you roll back Windows Vista SP1 to the release version of Windows Vista. In this situation, you may not have automatic access to the BitLocker-encrypted data volumes.
When BitLocker protects non-operating-system volumes in Windows Vista SP1, a new type of key is created. When you roll back to the release version of Windows Vista, the new key is unusable.
Additionally, when you enable BitLocker on data volumes in Windows Vista SP1, and then you roll back to the release version of Windows Vista, you lose automatic access to the data volumes.
Note Automatic access is restored when you upgrade to Windows Vista SP1 as long as you do not disable and re-enable BitLocker protection on the operating-system volume in the release version of Windows Vista. If you want to disable and re-enable BitLocker in the release version of Windows Vista, you should be prepared to lose automatic access to the data volumes even after you upgrade to Windows Vista SP1. You can still access to the data by using the data volume's recovery key or the recovery password.
To resolve this issue, do not disable BitLocker after you roll back to the release version Windows Vista from Windows Vista SP1. If you must disable BitLocker, turn off BitLocker for the operating system volume. In this case, you will lose automatic access to the BitLocker-protected data volumes. However, you can use the data volume's recovery key or the recovery password to access the data.