Firewire questions

I have a Toshiba Satellite M35X-S1492 with a 4 pin firewire connection.

I just bought a Maxtor onetouch T01W300 with Firewire 800, Firewire 400 and USB-2 ports.

Only Firewire 800 cables came with the Maxtor unit.

On the back of the Maxtor there is a USB port like you'd find on the back of a printer, 1 6-pin Firewire (400/800?) 2 Firewire 800 ports (know that because they say the cable is supplied)

Can I use FW 400 & 800 interchangeable with my laptop?

How can I find out if I have FW 400/800 on my laptop.

What are my choices of the connections on the Maxtor that can be used with my 4-pin FW my laptop.

Hope I'm making some sense since I'm unfamiliar with firewire.