Re: 12.04.1 CDs will not run
12.04 is different than 11.10. There are MANY old posts about the blinking cursor on black screen when you boot with nvidia graphics (I experienced that too). For 12.04 install, you need to use nomodeset kernel boot option. You no longer need that for the installed system once nvidia drivers are installed (which should happen automatically during install)
But, I cannot answer any questions about RAID.
I did have one laptop from 2006 (integrated Intel graphics) that for some reason would hang indefinitely (hours) without any errors 90% into installing 12.04 files with the regular install iso on USB. But the alternate install iso worked from USB and installed system works fine. I use 64-bit on everything including 2 GB tablet PC booted from SDHC card.
Other than that I have had no problems with 12.04. But I may hold off trying 12.10 (or install it where it can be tested first, like a USB drive), since many people seem to be having issues.
i5 650 3.2 GHz, 8 GB, nvidia GTX 1060, 32" 1080p & assorted older computers