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Subject: Boot windows on external disk : "not a valid root device"
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Hi,

I have a new Asus N56VZ laptop and replaced the Windows hard drive by a
SSD with Linux installed. EFI Grub2 successfully launchs Linux.
Now I'd like to boot Windows from the original hard drive mounted by USB.

No matter what I try, either using grub.cfg or command line, Grub's
chainloader fails :

> set root=3D(usb0,gpt1)
> chainloader ($root)/EFI/Microsoft/Boot/bootmgfw.efi
Error: not a valid root device.

The content of the drive may be seen using "ls".

What's the exact meaning of "not a valid root device" ?

Thanks,

--=20
Herv=E9