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What if win7 does not recognize usb devices?

  

Workaround:
1. Right click on "Computer”, under the list that appears on the right, select “Manage";
2, click to open the "Device Manager" under Computer Management. ”;
3, in the "Device Manager", click "Universal Serial Bus Control", in the "USB Root Hub" device list below, right click "USB Root Hub" After it's "disabled" menu, then "Enable", "
After completing the above operation, insert the u disk into the computer and try it, without restarting the computer.

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