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Originally Posted by RWood
The black object on my USB cable was not a resistor but more of a choke to limit the RF interference from and to the device.
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On another device, I was told it consists of a loop in the cable with a magnetic surrounding one part of the loop. In fact I have another USB cable where you can see the loop & a plastic tiedown holding the magnet(??) in place on the cable. The Sony cable has the "knobben" all encased if they are the same. And as RWood says, it has to do with RF emissions. Don't personally have the expertise to understand how it may work or why. Possibly elliminates noise problems on the line.