cannot disable fakeraid on installation

[grimreaper80]

Hello,

i wanted to install Ubuntu 11.04 on my pc (dual boot with windows xp which is already installed on one disk).
I have a Asus P5K pro (motherboard) which has a integrated raid controller and i have two 500 GB hard disks.
On BIOS raid is disabled. On Windows i see 2 different disks (correctly)..
When i try to install Ubuntu, on the disk/partition stagei only see /dev/mapper/xxxxxx which should be the raid (i could be wrong). I tried booting inserting the nodmraid option but if i do i cannot see any disk.

what can i do to solve this?

Thanks,

[YesWeCan]

There are metatdata blocks on your disks that Ubuntu is probably detecting and therefore assuming they are still components of a Windows RAID. To remove them:
sudo dmraid -E -r /dev/sdn where n is the drive letter

[grimreaper80]

Hello YesWeCan,

thanks for your prompt reply. I just tried what you advised and worked great.

Thanks!

[YesWeCan]

Pleasure. Would you mind marking this as solved in the thread tools menu?