Thanks for your help, it works with my laptop, but I now see that as that is a usb/esata port it is powered by the usb power of the port.
Any idea if there is a solution where I could attach the goflex drives via esata with power, the drive docks I see would not take the Goflex cases, and if I remove them from the cases I couldn't use them elsewhere.
I might just get this:
USB3 & sata card
then I could use the USB3 adaptor for the drives, plus I get extra sata connections, not that I'm sure what I could do with them!!
You can get cables with eSATAp on one end and standard eSATA + USB on the other, but they all use male plugs (AFAIK). I'd guess that the cable on the drive isn't detachable?
Adding a couple of USB3.0 ports is probably the simplest option.