I just called D LINK Technical Support (not sure why I chose to do so) and asked them to contact a Product Specialist for NAS. I asked if the device supports AFT. He said it may work, but they do not officially support AFT. They asked me to try at my own risk. I didn't want to uppack two new 2TB F4 hard drives and decided to call UPS and send it back to newegg. I didn't want to take chance and pay any restocking fees and shipping fees. I am hapy with Hitachi now.