The second problem: unrecognized usb device users often encounter this type of problem, now we are surrounded by more and more USB devices, then we come to analyze the unrecognized usb device failures solutions, unrecognized usb device processing methods summarized to bring together the most complete usb device processing methods, I hope to provide help to the users of the Rainforest Woodwind.
1. Front USB cable connection error. When the motherboard USB cable and chassis on the front of the USB interface corresponds to the connection of the positive and negative reverse will occur this kind of failure, which is also quite dangerous, because the positive and negative reverse is likely to make the USB device burned. So try to use the rear of the chassis USB interface, but also less use of extension cables. It may also be a problem with the breakout port, change the USB port to look at.
2. USB port voltage is insufficient. When the mobile hard disk connected to the front USB port may occur when the system can not recognize the device failure. The reason is that the mobile hard disk power requirements of the relatively large voltage is relatively strict, the front interface may not be able to provide sufficient voltage, of course, the poor quality of the power supply may also cause this problem. The solution is that the mobile hard disk should not be connected to the front USB interface, replace the low-quality low-power power supply or try to use an external power supply hard disk enclosure, if available.
3. Motherboard and system compatibility issues. Oh, the most famous of these failures is the NF2 motherboard and USB compatibility issues. If you are on a NF2 motherboard and encounter this problem, you can install the latest nForce2-specific USB2.0 drivers and patches, the latest motherboard patches and operating system patches, or if not, try to refresh the motherboard's BIOS generally can be resolved.
4. System or BIOS issues. When you disable USB in the BIOS or operating system, the USB device is not recognized in the system. The solution is to enable the options related to USB devices. That is, boot press F2 or DEL key, enter the BIOS, the enable usb device select enable.
5. Pull the plug to be careful, read and write must not be pulled out, or there may be burned chip. XP in the taskbar more USB device icon, open the icon will be in the list to show the USB disk device, choose to disable the device, and then you then pull out the device, this will be more safe and secure. You can also unplug the device, which will be safer.
In fact, to determine the software and hardware problems is very simple, in another machine or change the system to try it. Some of the smaller problems may be formatted with specialized software. There is a reminder that WINDOWS format to choose FAT, do not choose FAT32.
Prompted by the unrecognized USB device repair
Trouble prompted by the figure:
Unrecognized USB device: Unknown USB Device. Many people have encountered a problem, the so-called "unrecognized", "unrecognized", "unrecognized", "unrecognized", "unrecognized", "unrecognized", "unrecognized". "Unrecognized" for the operating system, or the degree of the driver is a problem, or USB device problems, or computer and USB device connection failure, the solution to the problem is also to start from these places.
There are different ways to deal with different devices. Understanding the conditions required for USB devices to work properly and some of the factors that may affect the normal operation of USB devices will help solve the problem.
The following are some of the conditions to ensure that the USB device can work properly: (1) the USB device itself does not have any problems - can be tested on other computers to ensure that it can work properly; (2) the USB interface does not have any problems - - can be connected to other USB devices to ensure that it can work properly; (3) the USB interface does not have any problems - - can be connected to other USB devices to ensure that it can work properly. - can be tested by connecting other USB devices on this interface; (3) USB device drivers have been correctly installed, if there are detailed instructions for the USB device, be sure to carefully review the corresponding instructions file, in accordance with the instructions to install the appropriate driver; Windows 2000 after the operating system to recognize most of the USB The Windows 2000 operating system recognizes most of the USB devices, and the operating system before Windows 98 can either install the driver that comes with the USB device or install a generic USB device driver.
The following are some of the circumstances that may affect the normal operation of the USB device: (1) the USB device has been a failure (the same conditions previously can be used normally, there is now a problem); (2) the USB interface has a problem, for example, a. USB front interface polarity is reversed, which may lead to the USB device burned, so be sure to look carefully at the motherboard manual, to prevent connecting the wrong; b. Interface voltage is insufficient, the interface is not sufficient, the interface is not sufficient to prevent the USB device from being connected to the wrong; c. The interface voltage is insufficient, the interface is insufficient, the interface is insufficient, the interface is not sufficient to prevent the USB device from being connected to the wrong. b. Interface voltage is insufficient, some mobile hard disk will often have such a problem, the host behind the USB interface is often more reliable than the front USB interface; c. Motherboard and operating system compatibility problems, install the latest motherboard drivers can maximize the avoidance of such problems; d. Bios prohibited USB devices, may be solved by changing the corresponding settings in the BIOS; e. Operating system problems, can be solved by reinstalling the operating system; (3) USB driver problem: If you suspect that the driver has a problem, you should ensure that the installation of the corresponding model of the device's latest driver or to confirm that the operating system does not need to install a special driver, the latest driver can be from the home page of the online device manufacturer to go to look for.
When there is a problem with a USB device, in addition to finding a solution based on the actual error message, it is important to look closely at the specific brand, model, and manufacturer of the USB device, and include this information in your search results to make it easier to find a solution. Like some of the insertion and extraction efforts need to often be connected to the state of the USB device temporarily failed, the operating system keeps appearing "unrecognized USB device" such annoying prompts, you can temporarily close the Universal Serial Bus controller in the device manager in the corresponding USB port or prohibit the corresponding USB device. After insertion, the computer will be in the lower right corner of the pop-up computer is trying to connect to this USB device some information, sometimes will pop-up dialog box for the user to choose, some users have not seen clearly on the point of no, or because of the computer some of the initial setup problems, prohibit some of the functions of the USB.
Solution: Right-click on "My Computer", select "Properties" - "Hardware" - "Drive Signature Then re-plug the MP3, or not connected, then right-click on "My Computer" - "Properties" - "Hardware" - "Device Manager", from which find the device manager. Manager", find the "Universal Serial Bus Controller", right-click, and then "Scan for hardware changes".
The voltage of the device itself
Because the trend of MP3 is to reduce the cost by all means, so companies continue to use new programs, new master control, new FLASH chip, not that these new things cut corners, the problem is that these new things often need long-term debugging to achieve the best, but the market situation can only allow the MP3 factory test can be in a computer interface on the line to the computer. But market conditions only allow the MP3 factory test can be in a computer interface on-line on the production, so often do not appear on-line, drop disk and other phenomena.
This situation requires the user to try a few more times, change the insertion of different USB interfaces, separate and then with a good quality USB cable (generally the thicker the better, copper is better than iron), and then to ensure that the MP3 power supply is normal (with a charger to the full power and then try again).
System error "unrecognized USB device"
Failure phenomenon: the use of USB flash drive computer accidental power failure, reboot after the USB flash drive can not be used normally, plugged in the system on the error "unrecognized USB device". The use of other original USB interface devices can be used normally, will prompt the same error message. The USB device will be plugged into the computer's other USB interface, can work normally.
Analysis of the fault: From the phenomenon, the USB device and the motherboard interface are not damaged, it is suspected that the accidental power failure caused by the system setup error.
Problems to deal with: from the "Control Panel" into the Add and Remove Hardware window, all USB devices will be deleted, reinstall the need to use the USB device driver. Restart the computer, USB flash drive and other USB devices inserted in the original fault interface can work normally. Unrecognized USB devices - laptop hard drive failure and removable hard drive, plugged into the front USB interface, can not be recognized.
This situation, a big reason is the power supply problem. Since the USB hard disk also needs to consume a certain amount of power when working, if the power is taken directly through the USB port, it is very likely that the power supply will be insufficient. Therefore, almost all mobile hard disk comes with a separate external power supply or through the keyboard to obtain power PS2 interface, then as long as the external power supply connected beforehand or through the PS2 adapter cable and the keyboard connected to ensure that the mobile hard disk to provide sufficient power and then try, then it should be able to use it normally. It is recommended that you make sure you have enough power before using the drive, otherwise the drive may be damaged due to insufficient power.
For those who have never used a USB external device, even if the driver is installed correctly, the system may not be able to detect the USB hard drive, which is mainly due to the motherboard's default CMOS port is closed, if it is not set to open the state, then Windows naturally can not detect the mobile hard drive. In order to solve this problem, we can reboot, enter the CMOS settings window, and in the "PNP/PCI CONFIGURATION" column will be "Assign IRQ For USB" a set to Enable" in the "PNP/PCI CONFIGURATION" section, so that the system can assign an available interrupt address to the USB port.
There is also a possibility that the USB port type does not match the USB port type, rendering the removable drive unusable. For example, if the computer is configured with a 1.1 standard USB interface, and the purchased mobile hard drive is a USB 2.0 standard interface, this requires that the cable connecting the computer and the mobile hard drive must support the USB 2.0 standard. Because the high-speed mobile device inserted into the low-speed hub, the device may not be properly installed, and some friends in the use of mobile hard disk at the same time also use a flash drive, in order to facilitate the direct use of the flash drive attached to the USB 1.1 standard connecting cable, which leads to the USB 2.0 standard of the mobile hard disk can not be recognized correctly. As long as the cable is replaced with a USB 2.0 standard, the problem can be solved.