I was trying to make a bootable antivirus USB flash drive to see if I could start a computer that refuses to start. Using Rufus.p I tried to burn the file Krd.iso and make a bootable USB flash drive. In the process two flash drives were destroyed. I got no bootable flash drive and I lost two USB’s. What happened? If any one of these two USB’s that got damaged is installed the computer just do not start. I would like to know what happened. I follow instructions carefully. Any help would be highly appreciated.