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A "double USB cable" is used to provide extra power to an external device, such as a hard disk in an external enclosure. It consists of two USB A-type plugs connected by a short length of cable (10-15 cm), with one of these two plugs connected by a longer cable (up to about 1 metre) to either a third USB A-type plug or a mini USB plug. You connect the "third USB A" plug or the mini USB plug to your external device enclosure and the USB A plug at the other end of the long cable to a USB port on the laptop. One USB port can provide up to 500 mA of current. If your external device needs more current, it will grind to a halt or even refuse to start moving at all. This will probably be true for bigger hard disks, CD burners and similar devices. You can then plug in the other USB A plug (the one at the and of the short cable) into an adjacent USB port on the laptop to double the amount of current available to the external device. Also seems to crop up on the internet as a "dual input USB cable".
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