How do I use my iMac's Firewire 800 port to connect to my external hardrive using a USB Micro-B input?

I have a late 2009 iMac with Firewire 800 input on the back.  I have a Western Digital Passport external hard drive with USB Micro-B input that I would like to connect to the Firewire (4 USB inputs aren't nearly enough on the iMac). I can't find an adapter to do this. Can someone please help??  As an alternative, is there an adapter that will convert the Firewire 800 to standard USB2.0?

USB and FireWire work in very different ways, so there is no adapter.
Instead, you should just get a USB 2.0 hub, like this one
http://eshop.macsales.com/item/NewerTech/USB2HB7PRO/
There are many choices, but be sure to get one that is powered (it comes with its own power supply).  Cheaper hubs rely on the computer's USB port for power.

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