HD showed up durring install, but not after.

[MaxCool]

I have two Hard drives, a WD 2TB, and a Seagate 500Gb. During a fresh win7 install, BOTH drives showed up. After 7 installed, I don't see the drive in My Computer. I checked "disk management" and it's not there either. What's the prob?

 

[wpcoe]

By any chance is your Win7 installation a UEFI boot to a GPT drive? And, if so, is the "missing" drive MBR (i.e. not GPT)?

When I had Win8 EFI booting to a GPT SSD, it would *not* see my two data drives that were MBR. Only after formatting one of them to GPT (wipes everything off the drive) would my EFI/GPT Win8 installation see it.