Actually it's not a choke but a ferrite bead. A ferrite material is essentially a magnetic sensitive ceramic (yes, they bust easily) that has a variable impedance to frequencies travelling through it. The impedance goes up with frequency. This rounds off the edges of pulses which really does nothing for the signal but does a lot for emissions. It is a device that is added to the cable expressly for high frequency suppression, either picked up or emitted.
Steve On Mon, Nov 24, 2008 at 9:32 AM, maccrawj <[EMAIL PROTECTED]> wrote: > Yeah, it's a RF choke and beneficial but required assuming the entire signal > path from PC to device is clean enough. > > Booting could be an issue since you are adding an extra device into the path > between host & device that the BIOS may not be able to cope with. > > Be careful using long and/or cheap USB cables as they do have length limits > which can be drastically shortened by noise & attenuation. > > Bobby Heid wrote: >> >> Thanks for the reply. >> >> So the little choke looking thing on the USB cable does not really do >> anything? >> >> I do have an older M/B. I'll check the BIOS when I am able to reboot. >> >> Thanks, >> Bobby >> >> -----Original Message----- >> From: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] On Behalf Of Winterlight >> Sent: Saturday, November 22, 2008 2:06 PM >> To: [email protected] >> Subject: Re: [H] USB cable for external drive. >> >> >>> connected to a powered USB hub on my desktop >>> because it will not reach my PC. Can I safely replace the USB cable that >>> came with the unit with a standard 6-foot USB cable? >> >> Yes, USB is USB. >> >> Also, why will my pc not boot when I have the external drive that is >> plugged >>> >>> into the hub and powered on? >> >> Some older motherboards are like that. If you have a USB drive plugged in >> and active they hang at post. Trying configuring your BIOS boot sequence to >> include that drive. >> >> >> >> >> >> >
