I have a large amount of files I want to transfer from one USB 2.0 device to another. I started transfer and found it transferring quite slow, around 8.5MB/s. I thought USB 2.0 had a theoretical limit of around 480MB/s. Practically, I expected around 30MB/s. I'm quite sure I've had 30MB/s going from a USB key to a hard drive, but in this case I'm going from a USB 2.0 external drive to another USB 2.0 external drive through my Dell Netbook (which has USB 2 ports). I'm thinking maybe one of the cables is only USB 1.1?