The 2nd generation of ASUS SSD Caching uses the 4x SATA 6.0 ports to support up to 3xSSD + 1xHDD for the most expandable, flexible SSD caching solution while maintaining a hassle-free setup. Combine the density of up to three SSDs to function as one without losing storage capacity due to cost. Set up is simple- plug in the HDD and SSD(s) into the designated ports and with one simple click, it will automatically detect and initialize setup and activation.