Newton's Theory of Gravity states that every object in the universe pulls on every other object. Every object feels this force, so it is a universal force. The force is always attractive; it is always a pull, never a push. Picture the force of gravity as the tension in an imaginary rope between two objects.
The whole point of a USB drive is to store lots of data in a small space, so think about what kinds of files you'll want to house on your flash drive. Movies and music take quite a bit of space, so if you're carrying your whole entertainment library with you, you'll want a big thumb drive â at least 16GB.
With thumb drives, performance is king. Now that there are many cheap options for USB 3.0 flash drives, there really is no reason to get a USB 2.0 drive. USB 3.0 brings much better file transfer speeds than what USB 2.0 could deliver. For example, the best USB 2.0 flash drives could only transfer files at speeds of 30 to 40MBps. The best USB 3.0 flash drives are closing in on 250MBps. It's important to note that USB 3.0 drives work in USB 2.0 ports; you'll just be limited to USB 2.0 speeds.