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If the USB port is not available in the BIOS start up boot sequence then it is not possible to boot up from an USB port on this notebook model. In this case the USB port will only be activated when Windows starts up from the internal hard disk and the USB driver is running.
Both USB ports use the same driver, so if one works and one doesn't, you have a mechanically bad port. You'll need to replace the hardware to solve the problem. There are usually a lot of bad D600 motherboards on Ebay. Or try to find just the USB port you need. Fairly simple replacement task, but laptop dis-assembly will be required to reach the part.
You will have to take the machine apart somewhat, or at least to the point of being able to disconnect and remove the usb port. Here's a link to the D600 service manual download. It will guide you through the breakdown process.