Re: Ubuntu has forced sda into a RAID
I did this taken from another thread to which I lost the link. fortunately I saved the instructions to a file:
Also there is a bug in 9.10 that mounts raid arrays that you have deleted. To fix it first turn off raid in your bios. Then load up the 9.10 live CD and open gparted. If you get a drive with a funny name like nvidia_ahahdhjdfsjkf then you have mounted a raid drive that you don't want.
To get rid of it, Open a terminal and type
. Note you want the disk name not the partition name. You can see your disk names in gparted. Mine was sda and sdb and my partition names were sda1 and sda5 and sdb1. I had to do both sda and sdb.
sudo dmraid -E -r /dev/name_of_your_disk
Once you have erased the raid meta data you should see the funny named disk disappear after restarting gparted.
Once you have verified the raid disk is gone reboot and your OS should boot.
Multi-boot: Arch linux, Ubuntu 12.04, Windows 7 & Windows 8