You may need to install Intel's Rapid Storage Technology driver. However, this will only work if you have the drives connected to the ports that are controlled by the Z77 chipset. The ports to avoid are the two gray ports on the very end (the ones closer to the top of the motherboard, or rather closer to the memory slots and 24-pin power connector). These are controlled by the ASMedia controller, and it is inferior to the Z77 chipset.
The two SATA 3 ports to use are the ones right next to the other 2 gray ones, meaning the 2 gray ports next to the 4 black ports.
In other words, the SATA 3 ports to avoid are labeled "SATA3_A0_A1", and the SATA 3 ports to use are the other gray ones labeled "SATA3_0_1".
If you're using either the black ports or those 2 good gray Intel-controlled ports, then installing Intel's Rapid Storage Technology driver should help.