I want to recover my password from my USB HDD

Hello,


I have USB HDD with AES Encryption 128.
The HDD has two partition. one is private and second is Public.
the private sector is only working in XP only, not in win 7. but public we can access.
now the problem is i forget the private sector password. i want to recover that...

and also i want to joint this two sector ..... plz help...