I want to know whether I can recover my deleted data from unlocked
drive or not.
I have done this in the last 48 hours because I had a power out and lost access to an encrypted partition. It wouldn't accept the password.
I used WinHex to clone the encrypted partition to another drive so "I" could attack it and then set Passware Kit Forensic loose on it. Took 6 hours but came back with a garbage password that I was sure wouldn't work but it did. So I was able to decrypt the partition.
I couldn't find what I was look for in the live files, so I then used NTFSUndelete to search through the deleted files area of the cracked and previously encrypted partition.
While I still wasn't able to find I was looking for ( I suspect now that it was never even on this drive), I was able to pull old and previously deleted files from the partition. The encryption process did not garble these into meaningless strings / binary data, if that's what you're worried about / hoping for.
You can pull deleted files from volumes previously encrypted with BitLocker. (Win 7 Ult)
Whether or not this applies in each and every case I obviously cant say but it is not completely impossible.