Peel open an ultra-slim notebook, Ultrabook, or tablet PC and you might discover an mSATA solid state drive (SSD) tucked inside. These compact drives are much smaller than a regular 2.5-inch SSD, and should you retire your ultra-slim down the line, or otherwise run across an mSATA drive, your options for plopping them into your desktop or full size notebook are few and far between. One option, however, is an Addonics 2.5-inch flash drive kit.