You said NAS but didn't reveal it's formatting. We know Windows won't identify most partitions beyond what Microsoft will admit to.
Why not start over as a fresh new drive. Delete all the partitions on that drive, create a new one and format it?
I had used this drive (SE16 - WD5000AAKS) as a NAS drive for quite awhile as a backup drive....but stopped using it awhile ago. I thought that I'd put it back into service but as a standard drive in my computer. I hooked it up with a SATA cable and it is recognized on the bootup screen and shows up even in storage/disk management....but not in My Computer. Its status is "healthy," but the only options that I get when I right click on the partition is "delete volume".
Here is a screen capture of the Disk Management screen: http://imgur.com/7KFj95l
While I am open to reformatting the drive (since there isn't really any useful info on it) I don't see why I should have to. Also, the option is greyed out when I right click on the disk partition in disk management?
Any ideas on how I can get My Computer to see the HDD?