How to avoid Firewire cable hum

Hi,
I am using a Firewire external drive to record from a video capture device that feeds into my Powerbook via a USB cable. I am noticing hum when I have both of these cables connected. I have noticed this before whenever I have a Firewire cable attached.
Are there Firewire cables that are shielded or are otherwise immune to causing hum? The two Firewire cables I have now are clear plastic and I can see a braided silver covering beneath it. Even though the Firewire and USB cables can come in on different sides of the Powerbook, I am still getting hum. I cannot separate the cables much more than they are now.
If there aren't cables that will prevent hum I am (bad word here). I have to record video to the Firewire external drive. I tried using a USB drive and had all kinds of problems.
Thank you.
John L

Thanks but you say 'in my USB audio interface', meaning in this case either the Powerbook USB port or the USB cable I am using for the capture? Would that explain the hum with the older CD burner? The hum occurred with a previous Powerbook when I used that CD burner. I haven't used that CD burner with this Powerbook.
I too am using the EyeTV, in this case the 250 Plus. I will write to them over the weekend since I wrote a BIG note to them recently and I doubt they're in over the weekend, and I wouldn't want to bother them then anyway.
I also have a somewhat funky arrangement for my incoming audio to the EyeTV converter/computer. I'll work to be sure nothing is shorting there. (I have one mini to RCA cable that I use an A/B switch to change from audio in and out to/from the stereo, that connects to the Powerbook. I put the EyeTV box inbetween the stereo and the computer so I could keep this arrangement for feeding audio to/from the computer to/from the stereo. It's worked fine with no hum without any firewire devices connected. That audio cable is not shielded. Very susceptible to (what, RF?) from firewire cables I guess... I might want to rethink those connections and get shielded ones. Do they make shielded RCA cables? Monster probably does = expensive.

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