HDD Not Showing up

[Dudebrah]

Hi,
The drive in question is a WD 250gb Caviar SATA drive (WD2500KS)
After building up my new system and installing windows and all that good stuff i decided to connect my 2 storage HDD's and after trying many different combinations one of my hard drives will not show up in My Computer. It does however show up in the BIOS and in the Device manager. My main drive is a WD 150gb Raptor, so I did have to load the drivers when installing windows. When I installed windows neither of my 2 backup drives were connected. When I connect them my old backup drive (WD 320gb SATA) shows up no matter what, but the new hard drive the 250gb drive will not show up even when the 320gb drive is connected. Everything seems to be running tip top with exception to this HDD problem. Any and all help is appreciated. Thanks

PS: The reason for installing without my backup HDD's connected is that on my first install the 320gb drive kept showing up as the C: drive and my main drive the 150gb raptor was showing up as F:

These are my computer specs
ASUS P5K-E
Intel E6750
4gb Corsair ddr2 800 ram
EVGA 8800 GTS KO
Sound Blaster X-Fi
OCZ 700W PS
Lite-On dvd burner
Sony dvd burner

 

[BillLeeLee]

Does the drive show up in disk management? It might have to be formatted/initialized.

Windows key + 'r' to get the run prompt
Type in 'diskmgmt.msc'

OR

Right click 'my computer' -> manage

 

[Dudebrah]

thanks much dude, formatted it and now its all good, thanks again