StoreMI is intended for systems with two storage disks, in this case a small SSD and a large HDD. It creates one virtual drive and aims to merge the (low-cost) capacity advantage of HDDs with the speed of SSDs:
StoreMI is a storage tiering solution that allows you to merge your SSD and HDD (or slower SSD with faster SSD) into one virtual drive. StoreMI moves data between both storage solutions, so it analyzes your data and moves frequently-used data to the faster SSD. In effect, the technique merges the capacity and pricing advantages of HDDs with the speed of the SSDs. That results in faster overall system performance, like snappier game and application loading.You can get StoreMI V2 at AMD's website.