can bitlocker to go pin be hacked? [closed]

view story

http://serverfault.com – I have acces to my system, win7 x64. I have a external hdd with a partition protected with bitlocker(to go I guess). TPM is not enabled. I only used a user pin and printed a recovery password. I lost the recovery password and i can't remember the pin. I'm sure i would remember the pin if I only have the first few characters of it. is there a way to brute force the first few characters of the pin of a extenal bitlocker protected hdd or can i forget it and is the information on it lost? (HowTos)