Chances are the drivers for your drive controller on the recovery disk are just recent enough to get the recovery environment booted, but not recognize the drives attached to the controller. Drive controllers of the same family can exist in many versions of firmware, so the drivers may not be able to work with the full feature set. Assuming you are working with a more recent version of the SRD, you can use the "Load Driver" tab in the recovery environment to load the correct driver. Be sure to use the Vista drivers for your controller, since the recovery environment is Vista PE. You can also build a custom recovery CD with the correct drivers, again assuming you have a more recent version of the product, i.e. version 7.0 or higher