before booting, i disabled in the bios all motherboard raid devices. after booting from the live i686 cd, i checked gparted -- it shows sda 153 gig all unallocated, sdb 153 gig all unallocated, and sdc 76 gig all unallocated. i also checked /dev/mapper, and confirmed that there were no nvidia_* devices are listed. fwiw, i also verified that /root/anaconda.cfg does not exist.
however, in the "install to hard disk" process, the partition table shows only 2 devices: mapper/nvidia_efcahfdg 314 gig all unallocated, and sdc 76 gig all unallocated. in other words, the install process apparently thinks sda and sdb are configured as a single raid device. how can i persuade install that sda and sdb are independent disks?
[in my first install attempt, i did have raid enabled in the bios, and allocated mapper/nvidia_efcahfdg during installation. rebooting from the hard drive failed, with a nash error about not being able to locate the mapped drive. i retried with raid disabled, thinking it might work better. wrong, so far, at least.]
solutions or hints are very welcome. thanks, ed