First of all, you will never run near 6Gbps, this is a theorical speed. For your issue of removable HDD, go in your bios and see if the hot swap fonction is enable on your sata3 controller. The other choice would be that the controller used by this mobo is acting like a USB for some reason that the engineer decided. But that would be dumb and not really plausible.
Martin_metal_88
Colenzo :Coolermaster ATCS 840 | Gigabyte's EP55-UD5 | Intel Core I7 860 @ 3.8Ghz | 4GB G.skill Trident 1600 | MSI GTX460 1GB HAWK Twin frozr | WD 640 black + WD 1TB green + WD 1TB Blue | Pionner DVR-216 | Silverstone Strider Plus 850W | Coolermaster Hyper 212 plus in push pull fan config |
Ask for more!