Why are the two firewire ports on the back of my iMac diffferent?

I currently have an external hard drive plugged in to one firewire port. But I noticed that I cannot fit my iPod connector into the other firewire port.
Why?
Intel-Based iMac 24" Mac OS X (10.4.10)

Look at this article iMac (Late 2006): External Ports and Connectors and go down to:
"Two FireWire Ports"
The iMac (24-inch) has one FireWire 400 port, and one FireWire 800 (IEEE 1394b) port, which supports transfer rates of 100, 200, 400, and 800 Mbps as a theoretical maximum load; actual rates may vary.
If your External HD has a second firewire port on it, connect the firewire iPod there. If not I would pick-up a firewire hub to prevent having to plug and unplug cords.
Dennis
17" iMac Intel Core Duo - 1.5GB Ram -   Mac OS X (10.4.10)   - Maxtor 300GB FireWire - Creative Inspire 2.1 - 2G Nano

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