You can't. You have to have a computer with a Firewire port, because DV and HDV are only transported that way.
Or you get a video capture device for USB and capture via that, but that will degrade quality and won't be HD.
If you use MRoogle you will find many threads asking about how to transfer DV or HDV to a Mac without Firewire, and you will see, that Firewire is needed for DV and HDV, but maybe some one had a solution like video capturing devices.
Btw, there is no Firewire to USB adapter.
WAS THAT FAST ENOUGH????