Not sexy but great,
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This review is from: Easy connect - 6 Pin (FEMALE) 400 to 9 Pin (MALE) 800 Firewire / iLink Adapter - Compact 800 to 400 FireWire Connector Adapter - iCables® (Electronics)
A mate of my son's was after a FW400 to FW800 connection between his MacBook and an esoteric bit of DJ mixing kit, so I gave him mine. Of course, that left me without being able to access my legacy backup drives which are FW400 and I only have FW400-FW400 or FW800-FW800 cables. On arrival, this plugged in and worked straight away - just like the old one in fact. This is a no-frills adaptor, no lights, no fancy logo and no lustrous finish - but who needs all that stuff? Data are blind and don't mind what the cables and connectors look like.