Outstanding Features The OWC Mercury On-The-Go features the latest in performance with an Oxford combination FireWire and USB chipset creating one perfectly integrated storage solution. The OWC Mercury On-The-Go's fanless design offers near silent operation while still keeping your drive cool. The built-in aluminum heatsink underneath the drive and passthrough cooling vents on the top of the case work in tandem to provide optimum results. The On-The-Go "Add your own Drive" Kit enclosure is ready to accept your own 2.5" SATA Hard Drive or SSD. Now you can upgrade your Mac or PC notebook's internal drive and retask that old drive as a new external drive for even more backup and storage capacity! This solution will give you an excellent transportable storage device, or a backup option that you may have not had!