Hi Paul,
Sorry, I should have clarify my intention.
I am currently using usb stick to transfer file to and from a cnc controller. The cnc controller does not have network capabilities.
I am wondering if I can use the Arduino as a usb mass storage device using the Arduino usb port and the SD card slot on a ethernet shield.
The cnc controller will access the sd card through the Arduino usb port and the sd card is also network accessible through the ethernet shield.
Is this setup possible?
thanks,
John