Bitlocker lost path

After an unattended installation of Windows 7 Ultimate, it started to encrypt my separate data disk. The PC was very slow. Stopped bitlocker at 11.4 %. After reboot every thing looks normal, but I can’t reach my data disk. If I resume or undo the encryption, I see the message ‘no path’.
The only thing I can do is a format.
Please help.

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