What is the Standard C: size for W2K3?

Hi there,

I am having a W2K3 server and intend to partition the drives to C: and D: drives however I'd like to know if there is a standard C: size? I am planning to make my C:\ as 40 GB while the rest goes to D:\.

Is this enough? Or should I allocate more space to C:|? How much of space does the W2K3 SE use?I was told anything above 20 GB is sufficient but I doubt it. Anyone can clear the air here?

Thank you.