Hard Drives Not Showing Up?

[kaboonkal]

I got a new SSD yesterday and installed windows 7 on it cleanly (had a SSD previously as OS drive).
I have 3 other HDD with lots of data on them.
When I use the new SSD the drives do not show up in My Computer, and in disk management they show up as unallocated.
I tried going back to the old SSD and they show up just fine with everything on them no problems at all.

What could be the issue here and how can I fix it without having to forsake all of my data on my HDDs?

 

[VJ_Gamer]

GO to disk management, Right click on the HDD, Select "New Simple Volume" and assign letter for the drive(Other than C).

Peace.