10-09-2010 04:33 AM
You probably have the type that fits on your power cord that runs your system. If so, it should just wrap around this cord and snap in place.
10-11-2010 06:12 AM
A toroidal ferrite core helps reduce RF-interference (noise from other electronic equipment or AM radio signals).
Ferrite cores typically go on DC-power cables (between the power adaptor and the device) because all the noise-filtering is within the power adaptor and they don't want noise added between the power adaptor and the device.
Ferrite cores can also found on any video or data cable that lacks sufficient shielding. Sometimes a device will use an unshielded cable because they want an extra-thin or extra-flexible cable, but sometimes it's because they are too cheap to use quality cable.