The solution of USB unrecognized by the voltage problem of the equipment itself under the WINDOWS7 system

Failure analysis: From the phenomenon, the USB device and motherboard interface are not damaged, suspected because of accidental power failure caused system setup error.

For this situation is generally due to power supply problems, because the USB hard drive in the work de time to consume a certain amount of electricity, directly through the USB interface to take electricity, there may be a shortage of power supply. As a result, almost all mobile drives come with a separate de external power supply or a PS2-turn interface that is powered by a keyboard. At this time as long as the prior connection to the external power supply or through the PS2 to connect with the keyboard, to ensure that the mobile hard disk to provide enough power after the test, then should be normal use of it.

Processing method:

From the "Control Panel" into the Add and remove hardware windows, all USB devices are removed, reinstall the need to use the DEUSB device driver, restart the computer, U disk and other USB devices plug in the original fault interface to work properly. USB unrecognized, notebook hard drive failure and removable hard drive, plugged in front USB interface, unrecognized.

PS: It is important to note that it is recommended that you make sure that you have enough power before using a removable hard drive, or you may be damaged by a lack of power.

There are other possible USB interface types do not make the mobile hard disk unusable, some computers configured USB interface is 1.1 standard, the purchase of the amount of mobile hard drive system USB 2.0 standard interface, which requires the connection between the computer and the mobile hard drive de connector must support the USB 2.0 standard.