Firewire cable - which one

I feel like an idiot posting a simple question but I cant work out what firewire cable to get to plug in an external hard drive. I have now bought two cables - the hard drive is a 6 pin but I cant work out which kind to get to plug into the mac socket. I have an imac intel 21.5 inch bought late 2009.
I only discovered this problem when the external hard drive is not being recognised by the mac via USB --- my other external hard drives work fine via the same usb port
Any help well appreciated

Hello morganfish
Welcome to Apple Discussions
If your External Hd's are FireWire 400 then you could use a 400 to 800 adapter. http://eshop.macsales.com/item/Newer%20Technology/FIR1369AD/
Or if we knew exactly what external HD(s) you had, then we might be able to suggest the correct FireWire cable to go straight from you External HD to your iMac's FireWire 800 port?
But it sounds like you need a 6 to 9 pin FireWire cable.
http://eshop.macsales.com/item/Newer%20Technology/1394B96036/
Dennis

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