Hello All, I need to create a slightly modified Centos 6.3 Net Install ISO. The modification is trivial, (a default kickstart in isolinux.cfg). I have created a new ISO by loopback mounting the original, copying to a new directory, editing and using mkisofs, and it works as expected. This is how I made the new ISO: <code> cd my_install_directory sudo mkisofs -o ~/centos63-ks.iso -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -R -J -v -T . </code> However, I an unable to copy this new ISO into a USB disk using dd, in the same manner as the original net install iso. I believe this is because the new ISO does not include an MBR. How do I include an MBR in the new ISO, so that it can be transferred to a USB disk via DD, in the same way as the original ? Thanks in advance Chandana