4-6 Pin FireWire Cable 1 Metre
Firewire 400 has two connection types. One with 4 pins and one with 6 pins. Many Windows based laptops are supplied with 4 pin FireWire ports (also known as IEEE1394, or just 1394, or 1394a) and lots of digital video cameras and computer peripherals are shipped with 4 pin FireWire ports.
The 4-6 pin FireWire cable is supplied so that you can connect your peripheral to your computer, if the one has a 4 pin port and the other a 6 pin port.
There is no data transfer speed difference between a 4 pin port and a 6 pin port. The extra two pins supply power to the peripheral, if the computer has a 6 pin port.