Multi-point: to deal with USB power shortage _windowsxp

The most common problem with USB device is the source of its power--the power supply is easy to solve. In order to effectively resolve the failure of the USB interface, this article specifically summed up some of the countermeasures, I hope to bring you useful!

　 how to identify the lack of USB power

Generally speaking, when the USB device is plugged into the Windows 2000 system, it can be automatically recognized by the system, and it can work properly, but many power-deficient USB devices are often shown the following symptoms after they are plugged into computer systems:

1, the computer system can automatically identify the USB device, and in the installation of the device driver is also very normal, but after installing the driver, but found that the device can not access the content, the performance of the device is unable to find the letter, can not use the device.

2, the computer system can not automatically identify the USB device, the signal indicator in the USB device is not bright or abnormal, even the USB device will emit unusual sound, such as USB interface hard drive if not enough, often hear the hard drive "click" of the abnormal operation sound.

3, in the absence of USB devices, the system can start normally, but one access to the USB device, the system does not start normally, and also appear error prompts, such as unable to find the system boot files, or system startup files are damaged.

4, even if the computer system can automatically identify the USB device, and the contents of the USB device can be accessed, but it is obvious that the access speed of the USB device is much slower than usual, or even the USB device in a long time, the device will suddenly appear access error, Or the computer system has no reason to panic.

Therefore, when you use the USB device in the process, found that there are symptoms of the above phenomenon, you must quickly to its source of power to carry out a check, lest in troubleshooting the process of many detours!

Once you confirm that the above symptom is caused by a lack of power to the USB device, you may refer to the following methods for quick response:

　　 1. External power supply Method

With the continuous improvement of the various technical specifications of USB devices, its working current is also "steadily climbing", for example, some of the fast speed of the mobile hard disk, its working current has reached the 1A standard, such power has exceeded the normal power of double, So at this time simply rely on USB interface for USB devices to provide enough power source is not very realistic. In order to ensure the stability of USB devices and computer systems, we must equip them with separate external power when using high-power USB devices.

　 2. Interface Substitution method

Now many USB equipment manufacturers, in order for the USB device to be produced, it will often provide several different connection interfaces for USB devices, and once the USB device is unable to obtain sufficient power from the USB interface, it can connect with other less power-consuming ports. This ensures that the USB device will work properly. For example, some USB ports on a removable hard disk are often not functional when connected to a legacy motherboard, but when connected to a computer with a different PS/2 interface, the removable hard drive works.

　　 3. Lower Power method

Under normal circumstances, the motherboard of each USB port power supply is 0.5A, if the USB device is working normally when the rated current exceeds this standard, the motherboard will not be able to accurately identify the USB device; At this point, the only feasible way is to use the low power consumption of USB devices, Or the use of a stand-alone power supply of USB devices to ensure that the USB device is working properly.

　　 4. Excluding the law of the different

The so-called "exclusion method" is to temporarily use other USB devices from the motherboard's USB port out, leaving only the urgent need to work the USB device, so that the motherboard for the USB device to provide a separate source of power to ensure that the device can work properly. Considering that each of the two USB ports in the new motherboard is divided into one group, each with a separate power supply, so that other USB devices are plugged into a port that is in the same group as the current USB device, the power that the current USB device obtains from the motherboard is affected, So when you find that your current USB device is out of power, be sure to unplug other USB devices that are temporarily unavailable, or plug it into a different set of USB ports.

　　 How to prevent the lack of USB power

In order to avoid the lack of power of USB devices as far as possible, we also need to do a good job in advance prevention:

First you need to select a highly configured computer to connect to the USB device, because of the high configuration of the computer, its motherboard performance is often superior, then it provides the USB port power current is higher than the old motherboard, so that the USB device plugged into the motherboard is not prone to lack of power failure phenomenon. Second, in the selection of USB devices, must go to the regular vendors or agents there to buy to ensure that the USB device itself stable performance, quality.