Unable to display the USB disk letter processing method

When the computer inserted u disk or MP3, always can not show the disk letter U disk, what is the problem? To sum up, the following solutions are obtained:

1, open the control surface version, point management tools, Computer Management, Disk Management, you will find in the inside and your disk like the size of the partition, and show a good state, you add at that point, and then add what you want to, and then you will see.

2, with other U disk or mobile hard disk to see recognition, if they do not recognize, it may be your machine's U disk port failure, so you can only replace the USB U machine interface.

3, if other U disk to recognize, you can take your U disk for USB oral test, before and after each mouth to try, it should be and your U disk port voltage output, and sometimes change the interface will be their own good, and even can be connected to the extension cord to try U disk contact. My machine now has this phenomenon, the front two mouth only one card reader, the other is not recognized.

4, think back to your machine recently did what update and installed what software, there may be these new updates and software with your U disk has conflicts, including anti-virus software upgrades and System package upgrades are possible, reverse operation or in safe mode to see or recognize.

5. Take the USB stick to another computer and try to see if it can be identified.

6, according to you above, you should be able to "my Computer" "Hardware Device" "Universal Serial Bus Controller" to find the device, update its driver.