MSI 890FXA-GD70 AM3 - Hard Drive in Sata Port 6 Not recognized in WIN7-[SOLVED]

Question

I just bought this motherboard (MSI 890FXA-GD70 AM3), new memory, case and processor.  I love it.  But while I can put something together, I do not consider myself much more then an experienced novice. 
Anyway, I bought a 5th hard drive and plugged it into SATA connector 6.  Connector 5 remains unused.  The new hard drive is recognized when the BIOS boots, but in Windows 7, I only show the first 4 drives like always.  I just want to use this drive as a 5th hard drive for normal use and storage.
I went into the BIOS to see if there was a setting I was missing; read through the posts to see if I could find the answer; and prayed to GOD, but nothing has worked!  I have found nothing on this topic, but then the FORUM is hard to navigate after a while with people not carefully choosing their topic subject name.  (Why do people sometimes post - I HAVE A PROBLEM - without anything in the SUBJECT line to help the casual reader know what they are asking about?)  My searches were fruitless, but then I know the key to a good search is using the right keywords.
I know this is going to turn out to be a simple setting, but can you help?  Thanks in advance!  And when the solution is presented, I will post back that ALL IS WELL!

Answer 1

PROBLEM SOLVED!  Found it myself through careful research.
This is the link that helped me: http://www.ithinkdiff.com/how-to-enable-ahci-in-windows-7-rc-after-installation/
Apparently, because I had IDE and not AHCI enabled in the BIOS, only the first 4 ports were being identified.  AND because I had not not changed the BIOS to AHCI before the installation of Windows 7, NO obvious way to change the setting AFTERWARDS!
In part what the post link above states:
AHCI  (Advanced Host Controller Interface) enables native command queuing and hot-plugging through SATA host controllers (Serial-ATA) for your hard drives. In many scenarios it enables more efficient multi-tasking. Vista was the first Windows OS to support AHCI out of the box, where as Windows 7 does the same. But an issue with AHCI is that if you install the OS without enabling AHCI in the BIOS, enabling it after installation will render your OS unusable. This is because Windows disable the AHCI driver since it is not needed during the installation.
There is one way to fix this, although you need to have knowledge of registry editing. The detailed steps from Microsoft are as follows:
To resolve this issue, enable the AHCI driver in the registry before you change the SATA mode of the boot drive. To do this, follow these steps:
   1. Exit all Windows-based programs.
   2. Click Start, type regedit in the Start Search box, and then press ENTER.
   3. If you receive the User Account Control dialog box, click Continue.
   4. Locate and then click the following registry subkey: HKEY_LOCAL_MACHINESystemCurrentControlS etServicesMsahci
   5. In the right pane, right-click Start in the Name column, and then click Modify.
   6. In the Value data box, type 0, and then click OK.
   7. On the File menu, click Exit to close Registry Editor.
After this you’ll have to restart your computer, go to BIOS and enable AHCI. When you log in to Windows again, you’ll notice the installation of drivers for AHCI. Another restart will be required to finish the driver installation.
I had been trying to select something in the BIOS other then IDE (choices are IDE, AHCI and RAID) to see if that would result in my 5th drive being recognized, but when I selected AHCI or RAID, the OS would flash the EVIL blue screen before it completed booting into Window 7. 
I copied the instructions here in case the link gets disabled in the future.  This link explained why I was having the problem I was having and how to solve it.
Thanks to everyone who tried to assist.  I consider this closed.