I just can't figure out the price of a C drive of an Azure VM.
As far as I can tell, I do have to pay extra for the 128GB C drive of a Windows Azure VM. The only disk space included in the price of the VM, is the D drive with temp data.

So, for a standard VM, this is clear to me. Total price of VM (without additional data disks) = VM price + costs of 128GB standard storage + IO's.

But how about a VM with premium disks? Will I be charged for a P20 disk for hosting the 127GB C drive of the VM, or am I able to host the C drive on standard storage (and get billed for standard storage), so that I can add an extra P20 disk as an E drive for my data / install apps?