the clue might be in the led. Watch the 7000 SD in use - it flashes every couple of seconds, maybe each file has to pass through the loading bus on its way out to the usb? Watch the card reader led - it flashes so fast it looks to be on permanently. The data is obviously moved in a single block with the card reader, its driver is direct ide compatible. Maybe the 7000 transfer has to go through another driver, or modified driver, for instance the midi data drivers might be slower?