Why does this keep popping up?

This message appears frequently when I’m trying to place pictures or videos onto my 4GB Flashdrive. Then, when I click to go back to the Flashdrive it shows there is nothing in it until I unplug it and put it back in. It happens sometimes but a lot more than it should!

"Cannot Copy (Name of File) : Cannot Find the Specified File!

Make sure you specify the correct path and file name"

that error means that the computer cant find the file you are trying to copy to the drive. if the file is really there and you can open it then it would seem you ahve a computer issue you need to take care of.