The most common problem encountered with USB devices is that it is the source of power - power supply is not easy; in order to effectively solve the problem of insufficient power of USB interface, this article specifically summarizes some countermeasures, I hope to bring usefulness to you! Insufficient recognition of USB power
In general, when a USB device is plugged into a Windows 2000 or higher system, it can be automatically recognized by the system and can work normally; after many USB devices with insufficient power are inserted into the computer system, often Will show the following failures: 1, the computer system can automatically identify the USB device, and it is normal when installing the driver of the device; but after installing the driver, it finds that the content in the device cannot be accessed, the specific performance The drive letter of the device could not be found, the device could not be used, and so on. 2. The computer system cannot automatically recognize the USB device. The signal indicator in the USB device is not lit or the status is abnormal. Even the USB device will emit an unusual sound. For example, if the hard disk of the USB interface is insufficiently powered, it will often be heard. The abnormal operation sound of the hard disk "咔咔". 3. When the USB device is not connected, the system can start normally. However, after the USB device is connected, the system cannot be started normally, and an error message is also displayed, such as the system startup file cannot be found, or the system startup file is damaged. 4. Even if the computer system can automatically recognize the USB device and the content in the USB device can be accessed, it is obvious that the access speed of the USB device is much slower than usual, even when the USB device is working for a long time. There will also be a sudden access error, or the computer system will crash for no reason. Therefore, when you are using a USB device and find that the above-mentioned fault phenomenon exists, you must check the source of its power as soon as possible to avoid more detours during troubleshooting. Once the above fault is confirmed by USB If the power shortage of the equipment is caused, you may wish to quickly respond to the following methods: 1. The external power supply method is accompanied by the continuous improvement of various technical indicators of the USB device, and its working current is also “smooth and long”, for example, some special speeds. Fast mobile hard disk, its working current has sometimes reached 1A standard, such power has exceeded double the normal power, so it is not very realistic to rely solely on the USB interface to provide sufficient power for USB devices. For this reason, when using high-power USB devices, we must equip them with a separate external power supply to ensure the stability of USB devices and computer systems. 2, interface replacement method Now many USB device manufacturers, in order to make their production of USB devices have enough "useful", often provide several different connection interfaces for USB devices, once the USB device can not be from the USB interface When you get enough power, you can use other ports that consume less power to connect, so that the USB device can be used normally. For example, when the USB interface of some mobile hard disks is connected to the old motherboard, it often does not work properly, but if another PS/2 interface is used to connect to the computer, the mobile hard disk will work normally. 3. Reduce the power method Under normal circumstances, the power supply of each USB port in the motherboard is 0.5A. If the rated current of the USB device works normally exceeds this standard, the motherboard will not be able to accurately identify the USB device; The only feasible way is to use a USB device with low power consumption or a USB device with independent power supply to ensure the normal operation of the USB device. 4, the exclusion of the so-called "exclusion of the law" is to remove the other USB devices that are temporarily unavailable from the motherboard's USB port, leaving only the USB device that needs to work urgently, so that the motherboard can be used separately The USB device provides the source of power to ensure that the device is working properly. Considering that each of the two USB ports in the new motherboard is divided into one group, each group is powered by a separate power source, so when other USB devices are plugged into the same group as the current USB device, then the current USB device is from the motherboard. The power gained in the game will be affected, so when you find that the current USB device is underpowered, be sure to unplug other USB devices that are not used temporarily, or plug it into another set of USB ports. How to prevent USB power shortage In order to avoid the lack of power of USB devices as much as possible, we need to do preventive work in advance: First, we need to use a high-configuration computer to connect USB devices, because the performance of motherboards is often compared with highly-configured computers. Superior, then it also provides a higher power current for the USB port than the old motherboard, so that when the USB device is plugged into the motherboard, it is not prone to power failure. Secondly, when selecting a USB device, it must be purchased by a regular distributor or agent to ensure that the USB device has stable performance and excellent quality.