what would be the risk?

Sir, i as my friend to re-format my laptop with Windows 7 x64 Home Premium, and he interchange my hard drive C: to D: memory capacity. so my D: now have more memory space, what would be the risk?

What do you wish to accomplish exactly?

Can you post back a screenshot of the maximized Disk Mgmt drive map and listings?

I'm confused as well. It is common, unfortunately, for people to consider hard drive space as memory. But, as gregrocker asked, seeing a screenshot of Disk Management should help get us on the right track.