The main question is if you have a fixed password scheme that you use for your passwords, and how good that is. It will be really hard and take long, but it might be possible:
WD Smartware for example back in 2015 were easy to crack due to them using a non-cryptographic random number generator. In the end, it all depends on if any security issues in the product make brute-forcing the password easier. First of all, what technology did you use to encrypt the harddrive? WD smartware? Bitlocker? Truecrypt? Veracrypt?
