What if the USB storage device cannot be identified?

When you want to use flash memory or mobile hard drive to exchange data with your computer, but when you plug in the USB port, you find that the system cannot identify the USB device. Why, here, I will briefly introduce the reasons for this problem after troubleshooting the USB storage device.
1.Frontend USB cable connection Error. WhenUSB cable on the motherboardAndFront USB interface on the chassisPositive/negative InversionThis kind of fault will occur, which is also quite dangerous, because Positive and Negative Inversion may makeUSB device burned out.

2.Insufficient USB interface Voltage. WhenConnect the mobile hard drive to the front USB portThe system may fail to identify the device. The reason is:High mobile hard drive power requires relatively strict voltage, and the front interface may not provide enough voltageOf course, poor power supply may also cause this problem. The solution is not to connect the mobile hard disk to the front USB interface. Replace the power supply of poor quality and low power or try to use the hard disk box of external power supply if possible.

3.Compatibility between the motherboard and the system. The most famous among these faults is the compatibility between NF2 motherboard and USB. If you encounter this problem on the NF2 motherboard, You can first install the latest nforce2 dedicated USB2.0 driver and patch, the latest motherboard patch and operating system patch, if the problem persists, refresh the BIOS of the motherboard.

4. system or BIOS problems . When you disable USB in BIOS or operating system , the USB device cannot be identified in the system. The solution is to enable the options related to the USB device.