Cd writer

[qanda]This thread is about the LG GSAH55N. Click here to see full specs[/qanda]My PC Configuration is:
Pentium 3 800 MHz

I have one CD writer(LG) & One Dvd Writer (LG). Problem is when i connect it simutaneously only one drive is shown by windows (CD Writer is shown).
But when i connect only the DVD writer it is shown properly by windows.
So now how can i connect both the Drives Simutaneously so that both the drives is shown properly. I tried to connect data bus in 2 ways but i am not able to fix this problem. So please help in this regard