aTV Flash(xmbc edition) Installation failed

I just downloaded aTV Flash (xmvc edition) today and been trying to installed it.
I currently have previous version of aTV on my Apple TV 1st generation.
Download and installer works just fine until it tried to erase thumb drive.
it stopped and said “Destroying partition failed. Installation unsuccessful”. “Process failed, try again”

I did “repair” and “verify” then even delete “partitions” on the thumb drive several time with Disk Utility but the problem remained same.

Please advise.