Many laptop computers have a 4-pin FireWire port. This is because 4-pin FireWire ports do not provide a power supply as 6-pin FireWire ports do. However, if you need to connect FireWire equipment with a 6-pin cable, the situation can be resolved in many cases by using this tiny adapter. However, this requires the connected device to have its own power supply, e.g. from its own mains adapter.
Sandberg Adaptor Firewire 6pF->4pM. Gender: Male/female, Connector(s): 6pF->4pM, Adapter type: Firewire. Color of product: Black. Width: 0" (0 mm), Depth: 0" (0 mm), Height: 0" (0 mm). Package width: 0.335" (8.5 mm), Package depth: 0.0787" (2 mm), Package height: 0.492" (12.5 mm)