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.