So far I have tried updating the chipset and usb drivers as well as the bios and all windows updates. None of that helped.
I thought I might of determined the problem to be a physical one. (though now i'm not so sure)
I noticed that if I plug the USB in half way and tilt it at an angle it does install the driver sucessfuly and transfers at speeds of 40-50 MB/s but this only works in this circumstance and usually doesn't last long; after wiggling it more or pluging it in fully the computer says "this device could perform faster if plugged into a USB 3.0 port". I called asus who advised me to return it to one of their third party repair centers to have a look. I'm pretty sure it's not the cable as I was able to test it on another laptop with 3.0 and it worked great.
I've just talked to the tech who looked at it and they seam to think it's the drives fault rather than the laptop but I'm not sure if i should believe them as the drive worked fine in another laptop i tried in on in the same enviroment. Their justification for saying this is that another drive they've tried works fine in the laptop.
Samsung support who I called were usless and told me to return it though they didn't even enquire as to the particular model or present any possible reason for the issue.
At this point I guess I need to determine for myself where the problem lies. Any ideas where to start? Hard to know who to go to in terms of reparing or replacment when I don't at least know this much...
This thread mentions the jmicron firmware the S2 uses has USB 3.0 issues but not sure if it's too relevant. http://forums.whirlpool.net.au/archive/1558885
My S2 drive model by the way: HX-MTD10EA