xXDahChubChubXx :
year you can stick usb 3.0 in 2.0 and vis versa
note if you plug them 2.0 into 3.0 transfer speeds might be slower and vis versa
^This. The transfer speed will always be the speed of the slowest item. ie, if you have a 3.0 USB Drive in a 2.0 Port, it will run at "2.0 Speed" and a 2.0 USB Drive in a 3.0 Port will run at "2.0 Speed" so you won't get the benefit of that 3.0 Drive you are buying.