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Solution for usb unrecognized due to voltage problem of the device itself under Windows7 system

Fault Analysis: From the point of view of the phenomenon, the interface between the USB device and the motherboard is not damaged. It is suspected that the system is set incorrectly due to an unexpected power failure.
For this kind of situation, it is generally due to the power supply problem. Since the USB hard disk consumes a certain amount of power when it is working, and directly takes power through the USB interface, there may be insufficient power supply. Therefore, almost all mobile hard drives come with a separate external power supply or a PS
2 transfer interface that is powered by the keyboard. In this case, just connect the external power supply or pass PS
2 Connect the patch cord to the keyboard, make sure to give enough power to the mobile hard disk and try again. It should be ready for use.
Processing method:
From the “Control Panel”, enter the window for adding and removing hardware, delete all USB devices, reinstall it, use the deUSB device driver, restart the computer, USB device, etc. It works fine on the original faulty interface. The usb is unrecognizable, the notebook hard drive is faulty and the mobile hard disk is plugged into the front USB interface and cannot be recognized.
ps: Need to pay special attention to everyone's attention, it is recommended to ensure that there is enough power before using the mobile hard disk, otherwise it is likely that the hard disk is damaged due to insufficient power supply.
There are other possibilities that the USB interface type does not match the mobile hard disk. The USB interface of some computers is 1.1 standard. The purchased mobile hard disk is the USB 2.0 standard interface, which requires connecting the computer and the mobile hard disk. The cable must support the USB 2.0 standard.

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