I installed Truecrypt on a new laptop with Windows 7 and started encrypting the system partition. While encrypting, I ran another program which froze the OS. I had to turn the laptop off and reboot, and after rebooting the encryption process restarted.
Everything seems to be ok, but is there any chance that I lost the data which was being encrypted at the time of the crash of the entire OS, or does Truecrypt perform a verification of the encrypted data before marking a sector as encrypted?