Windows 7: WMC recording drive

A newby here.
Here my setup. I am using a Ceton Infinity 4 tune card for the tuner card. I have a 55g ssd card as my c drive. I have a 1tb {d drive} drive that I trying to use a recorder drive. When I setup WMC in the recorder section I clicked on the d drive as the drive to record to. I have about a 100g of hd programs on the d drive. Tonight I had castle and Hawaii 5 0 set to record. 2 to 10 a box came up say Hawaii 5 0 will not record because there not enough spcace for to record to but yet I got 800 g left on the d drive. I checked the favorite folder and it have a folder named recorder with drive under it.
What could be the problem?

WMC by default, won't allocate the entire 800 Gb to D.
You can allocate more space for recording, if needed.

How can I allocate more space to my d drive?

Managing recorded TV shows in Windows Media Center: frequently asked questions

That how I set it up but for some reason it not going to the d drive it recording on c drive which has only 20gb left after windows 7 setup. I did have the d drive as my c drive maybe that is the problem. I going to wipe both c and d drive and reinstall every thing again and see if that helps.