Tried KillDisk virus yesterday against EAZ-FIX/ RollBackRx and FDISR on a test PC. It destroyed current working system in EAZ-FIX but I was able to boot into previous snapshot/ snapshots without any problem. With FDISR, It erased every thing on disk. On reboot no FDISR prebpoot was available and no way to get back the system. I checked via BartPE, all the disk was blank and all partitions destroyed, had to reformat. I did not tried it in frozen snapshot, will try later after I reinstall OS.