11-18-2015 03:34 PM
expresscache will not cache anything is the system drive is an SSD. It will ignore all data stored on SSD since there would be no performance gain when caching data that is already on an SSD.
For your other questions about getting the 24GB ssd to show as a drive that is a better question for Asus. i would recommend you contact them as your product is OEM and all support is handled by the host manufacturer.