Fun with ultraiso

Previously, I used Nero 7.5 to burn the disc, but recently encountered some problems. If a Windows system installation disk is burned to an image with Nero, the press any key... cannot be displayed during testing on the VM ..., it will directly skip the CD and boot from the hard disk is very depressing, it is suspected that it is a problem with the disc, but to choose to start from the external drive will be successful, then I think it should be caused by incomplete data on the disc, instead, use the ultraiso tool-> to create a CD image file... after direct burning, the VM can be smoothly started from the ISO, analysis may be caused by some system startup information on the CD, which is not burned by Nero.