Quote Originally Posted by Clive View Post
I'm aware the ferrite chokes aren't necessarily a good thing but they are very inexpensive to try. I can't say whether the cable that came with my Toshiba USB drive is certified or not but presumably Toshibiba put it there for a reason - I don't expect they was the product to cost 1 cent more than it needs to.

If a cable is certified does it mean the cable is perfect? What I'm getting at is if the device at the end (or start) of the cable is horribly noisy then a certified cable is unlikely to do much to reduce the noise. Maybe a certified cable is just the starting point for such a noisy environment. What's at the receiving end should take noise in to account (hence the regeneration comment I made) but I suspect that multiple levels of cleaning will help in some situations.
I thought that the ferrite choke was to stop noise originating from the USB peripheral device getting out via the shield. Is this not the case?