Cause analysis:
Booting ESC can not find the U disk because the Legacy USB Support is turned off in the BIOS settings Now, just turn it on.
1. First, press F2 to enter the BIOS when booting win7, go to Advanced——USB Configuration——Legacy USB Support;
2, then change the value to enable, F10 Save and exit, this will be fine.
ps:Legacy USB Support: This option means to support USB devices in the traditional operating environment. If it is in the Disable state, the U disk, USB interface keyboard and other devices will not be recognized when the system is not entered.
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