As for the cables yes. This error message as I indicated with all other things (hardware) being equal, did not show up when I then tried to install 7.0rc1, but did when I tried 6.0.1.
At this point, I have a fully functional server (mode) install that is updated and shows 7.0rc2 (through yum updates. The hard drive setup is that on ide channel 1 I have one disk as master and primary. On ide channel 2 I have another hard drive (same make size etc) as master and primary, with the cd drive as slave.