Now we use USB devices more and more, and no problems are missing, software or hardware problems with USB devices that let us analysis and troubleshooting.
1. The front USB line wrong. When the motherboard USB line and the front USB port corresponding to connect on the case take the positive and negative reverse this kind of failure occurs, it is also quite dangerous, because the positive and negative answer is likely to make the USB device burned. So as far as possible the rear casing of the USB interface, also use less extension cord. Also could be the fracture, change the USB port to see.
2. USB interface voltage is insufficient. When connected the mobile hard disk on the front USB port can occur when the system is unable to identify the fault of the equipment. Reason is the mobile hard disk power is larger voltage is relatively strict, front interface may not provide enough voltage, bad power supply, of course, also may be the cause of the problem. The solution is to don't answer the mobile hard disk on the front USB port, the power of the replacement of inferior low power or try to use an external power supply M4300 SATA HDD caddy fixings, if conditional word.
3. The motherboard and system compatibility problems. Ha ha this kind of failure is the most famous of NF2 motherboard with USB compatibility problem. If you are on the mainboard of NF2 encounter this problem, you can first to install the latest nForce2 special usb drivers and patches, the latest patches and mainboard operating system patches, or if not try to refresh the motherboard BIOS are generally able to solve.
4. The system, or BIOS issue. When you disable the USB in the BIOS or operating system will occur when the USB device can't identify in the system. The solution is to open the options associated with USB devices. Is the boot press F2 or DEL key, enter the BIOS, the enable usb device select the enable.
5. Pull out plug need to be careful, never pull out when reading and writing, otherwise likely burned chip. XP more USB devices in the task bar icon, open the icon will be displayed in the list U disk device, choose to deactivate the device, and then you pull out the device again, it will be more safe.
Actually determine software hardware problem is very simple, in other machine or try it is ok to change the system. Some small problem please use special software format. And remind everybody under WINDOWS format to choose FAT, don't choose FAT32.
Tip can't identify the USB equipment maintenance
Unable to recognize the USB Device: Unknown USB Device. Many people have met a problem, the so-called "unable to identify" for the operating system, or the driver level there is a problem, or a USB Device there is a problem, or is a computer connected to the USB Device fails, the method to solve the problem is also begin from all those places.
For different devices have different processing method, the conditions of the USB devices work properly need to understand and some possible factors, which affect the USB device to work properly, can help to solve the problem.
Below is some condition of guarantee the normal work of the USB device can be:
(1) the USB device itself does not have any problem, can through the test on other computers, can guarantee the normal work;
(2) the USB interface without any problem, can through the USB device connected to the other interfaces on this test;
(3) USB device driver has been installed correctly, if there is a detailed specification of USB device, be sure to take a closer look at relevant documents, in accordance with the instructions to install the corresponding driver; Windows 2000 operating systems to identify most of the USB device, Windows 98 operating system can be installed before the USB device driver or generic USB device driver installation.
Here are some circumstances may affect the USB device to work properly:
(1) the USB device has failed (the same conditions can be normal use before, now there is a problem);
(2) the USB interface have problem, such as reverse polarity, a.U SB front interface that could lead to a USB device burned, so be sure to check the motherboard manual carefully, prevent the wrong; B. the interface voltage is insufficient, some mobile hard drives often have such problems, the host at the back of the USB ports tend to be more reliable than the front USB port; C. the mainboard and the operating system compatibility has a problem, install the latest motherboard drivers can best to avoid such problem; Db ios banned USB devices, may by changing the corresponding Settings in the BIOS to solve; E. operating system problems, can be addressed by reinstall the operating system;
(3) USB driver has a problem: if you suspect that drivers have a problem, shall guarantee the corresponding models of the latest driver installed the equipment or to confirm the operating system does not need to install special driver, latest drivers can find equipment maker's home page from the Internet.
When occurrence problem of USB devices in addition, according to the actual error message information to find a solution, but also take a closer look at the USB device specific brand, model, manufacturer, including the information in the search results, it is easier to find the corresponding solution. As some plug trouble need often in the connection state of the USB device malfunction, temporarily operating system appear constantly "USB device" unable to identify this annoying prompts, can temporarily shut down in the device manager of universal serial bus (USB) controller corresponding USB port or USB device.
About can't recognize the usb device
Computer Settings
After insert, it will pop up in the lower right corner is trying to connect to the computer USB devices, some of the information sometimes will pop-up dialog allows users to choose, some users don't see the point of no, or because the computer some problems setting up the initial, banned some of USB function.
Solution: click "my computer", choose "properties", "hardware", "signature" drive, in the choice to "ignore", "ok". Then to plug in the MP3, or not even, and then click "my computer" -- "attributes", "hardware", "device manager", find "universal serial bus controller", right-click, and then the "scan test hardware changes".
The device itself voltage problem
Because now the trend of the MP3 is one thousand party hundreds of cost reduction, so the company is constantly new solutions, new master, new FLASH chip, is not to say that these new stuff to cut corners, commissioning of the new problem is that these things often require long-term in order to achieve the best, but market conditions can only allow MP3 factory test can online on a computer interface is put into production, so often appear don't online, off the plate. 3 lian.com
This situation requires users to try a few times more, in different USB plug, alone with a good quality USB line (general as thick as possible, the copper is better than iron), and then ensure that power supply normal MP3 (electricity with charger try again).
The USB device "system error" unable to identify
Fault phenomenon: when using the USB computer unexpected power outages, U disk can't normal use after the reboot, plug in the system error "unable to recognize the USB device". Use other originally the USB interface equipment can normal use, can prompt the same error message. Insert USB device to the computer on other USB interface, can work normally.
Failure analysis: from the point of view of phenomena, the USB device and the mainboard interface without damage, doubt is accident caused power system set up error.
Problem: from "control panel" window into the add and remove hardware, will all USB devices are removed, replace the need to use the USB device driver. Restart your computer, U disk and USB device inserted in the original works on failure interface. Unable to recognize the USB device - faults and mobile hard disk, notebook hard disk inserted in the front USB port, can't identify.
This kind of situation, largely because is power supply problem. Because the USB hard disk at work also needs to consume a certain power, if we directly through the USB interface to get electricity, very likely. Therefore, almost all the mobile hard disk comes with a separate external power supply or the PS2 keyboard for electricity, by turn interface, then as long as the good connection in advance or by an external power supply PS2 turn good connections with the keyboard, make sure to try again after enough electricity mobile hard disk, then should be able to normal use. Need special remind everyone's attention, recommend the use of mobile hard disk before they ensure sufficient power supply, otherwise it may result in hard disk damage caused by a lack of power supply.
Has not been used for USB peripherals friends, even if the correct installation of the driver system is always a possibility, to detect a USB hard drive, this is mainly due to the motherboard CMOS port is off by default, if you don't set it to open, so Windows can't detect natural mobile hard disk. In order to solve this problem, we can restart, enter the CMOS Settings window, and in the PNP/PCI CONFIGURATION "section" to Assign IRQ For USB "a is set to" Enable ", this system can give USB port interrupt address available For distribution.
It is also possible that the USB interface type does not result in mobile hard disk cannot be used. Such as computer configuration is USB 1.1 standard, and buy mobile hard disk is USB 2.0 interface standard, which requires the connection computer and mobile hard disk cable must support USB 2.0 standard. Insert hubs at low speed for high-speed mobile equipment, this equipment may not be installed properly, and some friends in the use of mobile hard disk at the same time also use USB flash drive, for the convenience of directly using the USB 1.1 standard USB flash drive attached to the cable, so it lead to USB 2.0 standard is unable to correctly identify mobile hard disk. As long as the connector replacement for USB 2.0 standard can solve this problem.
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