Everything looks like it's labeled correctly, but I actually don't know what 6 is. My first instinct is PATA/IDE connector, but that's already there. I'm too lazy to look at MOBO's on Newegg right now, but I'm sure it could help on figuring it out. *hint, hint*.
Edit-
Looking at it again. You have SATA all classified for eSATA (black) and SATA (blue) Also, those aren't all just PCI. You have PCI-e too. Actually, what I think is eSATA is more than likely firewire. Neither I have ever used.
And just to confuse the hell out of you. IDE describes both PATA and SATA. It's just that IDE is used loosely for PATA.