yeah, it it a error in your cd , which may cause a invalid image , just are burn 4 cds I understand that. Try to copy your cd to disk first and you will see that you can't copy I found I got an unrecover error in my cd . cp: reading `/media/WindowsXP_EN/I386/WINNTUPG/SRVINF/NETUPG.INF': Input/output error cp: failed to extend `./WindowsXP_EN/I386/WINNTUPG/SRVINF/NETUPG.INF': Input/output error