Problem with USB image install

[Dmitriy Tochansky]

Hi!

I'm trying to install dfly to my lenovo x220 laptop using usb-stick 
image. It starts normaly but fails to mount rootfs "no disk named 
'da8s1a'". Previous string if "da8: reading primary partition table: 
error accessing offset 000000000000 for 512" The same stick works on 
"big brother". Anyone had same problems? May be some BIOS magic needed?

-- 
dtoch