I take minimal (netinstall at second try) centos 6.2 ISO
then I modify it and write to iso. Resulting ISO is working - I can install OS on VMWare. But IT IS ASKING TO SKIP MEDIA CHECK.
This disk will be used to install on computer that has not have keyboard,mouse and display. Resulting Iso is working but needs a attached keyboard and press "right" than "enter" to skip memory check.
All is working except disabling "skip media check" dialog