Copying (usb drive to usb drive) suddenly slowed down. Ubuntu Server 12.04

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http://askubuntu.com – I just got an old computer from a friend and I am using it as a mediatomb server. Because the computers hard drives are rather small and I don't have the money for newer ones I am temporarily using 2 usb drives to store all the media. I am currently in the progress of transferring all my media files from my three other computers to these 2 drives using a third. Until yesterday this all went smoothly, but since this afternoon, when I started a new 'batch' of copying my copying speed suddenly dropped to app. 0.4MB/S (according to nautilus) To clarify: I didn't touch the computer between finish (HowTos)