http://www.synchrotech.com/
CAB-FW8-6-9-CONV Buy Now
CAB-FW8-6-9-CONV FireWire 800 IEEE1394b 6pin (female) to 9pin (male) Converter Plug
Accepts 6 pin male cable end
Attaches 9 pin female host or peripheral port
MacBook Pro (15-inch, Late 2008) Ready!New Mac 2009 Ready! MacBook Pro (15-inch, Late 2008) and all new Mac (post 2009) Ready! An inexpensive alternative to using 6 to 9 Pin FireWire cables with the latest Macs which feature FireWire 800 ports. Allows use of 6-Pin FireWire 400 devices and cables on any 9-Pin FireWire 800 port, including those on MacBook Pros, iMac, Mac Mini, and Mac Pro.
Features
* Allows use of 6-pin cables with 9-pin ports on devices or hosts
* Plug and play operation installs easily without drivers
Specifications
* Placing a 6-pin connection anywhere on a FireWire 800 cable run reduces connection speeds to those of FireWire 400 (IEEE 1394a)
* Transfer Rate: up to 400Mbps
http://www.synchrotech.com/product-1394/firewire-400-800-cables-connectors_01.html#CAB-FW8-6-9-CONV