I want to buy a card reader for my D800 files. I note that all the good readers are USB 3.0 and my current computer only has USB 2.0. Am I correct in assuming that I could use the 3.0 card reader plugged into a 2.0 USB port? I am aware that I would not get the speed of USB 3.0 but then my present cards are only 60MB/s. I will probably be upgrading computer in the not to distant future so if I can use the 3.0 reader in a 2.0 port I will get the good reader. If not I will just get a cheap 2.0 reader for use until I get a new computer.