USB Recognition

1. External power law
With the continuous improvement of the various technical indicators USB devices, its current work is "steadily climbing long," such as some special fast-speed mobile hard disk, the operating current 1A sometimes have reached the standard, such power has exceeded the normal power double, so in this case simply rely on USB interface provides a sufficient source of power for the USB device is not a very realistic. To this end, we use high-power USB devices must be equipped with a separate external power supply, so as to ensure the stability of USB devices and computer systems.

2. Interface replacement method [10]
Twenty-first century twenties lot USB device manufacturers, in order for it produced USB device has enough "useless", often provide several different interfaces to connect a USB device, the USB device can not once from USB an interface to obtain sufficient source of power, also can use other ports to consume less power connections to ensure that the USB device can be used normally. For example some mobile hard disk USB interface to connect to the old motherboard, often does not work, but if you use another interface pS 2 / to the computer, mobile hard disk can work normally.

3. Reducing the power law
Under normal circumstances, the motherboard power supply per USB port is 0.5A, and rated current If the USB device is working properly when more than the standard, then the motherboard will not accurately recognize the USB device; this time, the only viable option It is the choice of low power consumption USB device, or choose a separate power supply USB devices, in order to ensure the USB device is working properly.

4. Exclude dissidents law
The so-called "dissidents exclusion method" is less than the temporary removal of other USB devices from the USB port on the motherboard out, leaving only the urgent need to work in a USB device, which would allow a single board to provide the source of power for USB devices to ensure that the device can work normally. Taking into account the new board in each of the two USB ports into a group, each group using a separate power supply, so other USB device is plugged into the current USB devices are located on the same set of ports, then the current USB devices from the motherboard the dynamic energy obtained will be affected, so when you find a USB device the current lack of motivation, be sure to being less than other USB devices to pull out, or insert it into a USB port on the other.