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USB leads

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fly258 | 19:42 Fri 26th Nov 2004 | How it Works
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What are the small barrel shaped things near the ends of some USB and power leads on computers?
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i think they may be RF chokes designed to reduce parasitic waveforms and interference 

agree with romko, they are ferrite rods.

They're called Ferrite Cores and they reduce the amount of electromagnetic interference. They're most common on USB leads from digital cameras as interference can cause data loss and therefore, loss of image quality while transferring the image to your computer.

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USB leads

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