Xen: ‘this operation cannot be performed’ (virtual disk not found) error

I'm doing it on my 64GB ram server ;) Hyper V + VSuite RamDsik

This is embarrassing but after two days of bashing my head on this, I think I solved it myself.

My grub menu file had commands like root(hd0,0) instead of root (hd0,0). The space is essential, and all my attempts left it out! I found this out by discovering that leaving the root line off and specifying the full path like kernel (hd0,0)/boot/vmlinuz.... worked. The lack of space did not cause any kind of parsing error, but it seems to have just been ignored. As a result it really didn't matter what values I gave it, it was just going on defaults anyway, hence the same result with the line left out entirely.

I still don't have a booting system, but I'm past the problem with grub now and onto kernel woes. Hopefully anybody else who runs into the same problem will find this solution helpful!