1.
Front USB cable connected wrongly. When the motherboard’s USB cable and
the chassis on the front USB port corresponds to a reversed-phase
positive and negative at the time of such failures occur, which is quite
dangerous, because the positive and negative anti-access USB devices
are likely to make fire. So, as far as possible the rear chassis of the
USB interface, but also to use fewer extension cords. Fractures may also
be a problem from another USB port .
2. USB interface voltage of
less than. When the mobile hard disk connected to the front USB port is
likely to occur when the system is unable to identify equipment
failures. The reason is the larger HDD power demand voltage is
relatively strict, pre-interface may not provide sufficient voltage, of
course, poor power supply may also cause this problem. The solution is
not to move the hard disk connected to the USB port on the front,
replacing low-quality low-power external power supply or make full use
of the hard disk box, if able to do so.
3. Motherboards and
systems compatibility issues. Here this failure is the most famous NF2
motherboard compatibility issues with USB. If you are in the NF2
motherboards encounter this problem, then you can install the latest
drivers and patches nForce2-specific USB2.0, the latest motherboard and
operating system patch, or does not work, then try to refresh the
motherboard’s BIOS is generally can be resolved.
4. System or
BIOS problem. When you are in the BIOS or the operating system will
occur when USB is disabled USB devices can not be identified in the
system. The solution is to open with the USB device-dependent options.
Press F2 or DEL is key to boot into the BIOS, to enable usb device
option enable.
5. Swappable to be careful when reading and
writing must not pull out, or may be burnt chips. XP, the taskbar icon
for more USB devices, open the icon will be displayed in the list U disk
device, select the device to disable, and then you unplug the device
again, that would be more secure.