The FW material is often obsolete because of changes and developments in MacPro, iMac and others who have more than 800 of the FW while our external CD-burner drives are still perfectly usable. This possibility of connection starting from a FW 400 to FW 800 is a good tool, cheap and perfect to keep our equipment FW 400 and connect it to the new generation of Macs. Very good product. Very very good seller. Shipping and packaging quality copies. Good value for money.