Thin/TBZ disks cannot be opened in multiwriter mode

Hi,

I have 2 VMs that I am going to setup in an MS cluster. I have created the shared quorum disk (tried both RDM, and creating a new thick disk), but I keep getting this error when I try to power on the machine.  THe problem is, it is referencing the main disk in the error which is not the one I am wanting to share across servers.  This disk IS in Thin, but I don't understand why that would matter since I am not asking it to be shared.  I have created a new controller for each of the new disks.  Does my main disk have to be Thick too even though it is not going to be shared?

Thanks.