These USB Thumb Drives offer 64GB of storage space paired with a type A USB 3.0 port. Of course, they are still backwards compatible with USB 2.0, should you be using an older machine. When used with USB 2.0 ports these will function at USB 2.0 speeds. The USB 3.0 spec uses two unidirectional data paths to send and receive data at the same time, instead of using a single bidirectional data path as in older USB specifications. USB 3.0 devices also offers transmission speeds of up to 5 Gbit/s, making them a great choice to use for tasks requiring constant disk access. Video and Sound editing, photo manipulation (photoshop), etc. Note: Performance of these USB 3.0 drives may vary depending on your hardware setup. Some machines give poor USB 3.0 performance due to not having the proper drivers installed and/or having the wrong USB 3.0 drivers installed. To get the best performance, be sure to install the most current drivers and firmware updates for your USB 3.0 controller.