Get the Whitepaper called Firewire-based Physical Security Attacks on Windows 7, EFS and BitLocker.
You can download it from the following link: https://packetstormsecurity.com/files/download/80337/windows7_firewire_physical_attacks.pdf
Source: https://packetstormsecurity.com/files/80337/Windows-7-Firewire-Attacks.html