How to make a Win7U disk boot disk?

First, let's open the downloaded Win7 system ISO file with UltraISO.

UltraISO making Win7U disk boot disk step one

UltraISO making Win7U disk boot disk step two
Next select the start button → write hard disk image, at this time to ensure U disk or The mobile hard drive has been plugged in.

UltraISO to make Win7U disk boot disk step three
In the pop-up dialog box, select the boot U disk or mobile hard disk to be backed up, if there is data in it need to backup in advance and then select format, if it is empty Just click on the write.

UltraISO making Win7U disk boot disk step four

UltraISO making Win7U disk boot disk step five

UltraISO making Win7U disk boot disk step six
I believe everyone has learned how to Make a USB flash drive that can install Win7 system. When installing the system, just switch to USB HDD in the BIOS to start. It should be noted here that during the installation process, the first reboot of the system requires that the boot entry be turned into a hard disk boot, otherwise the default U disk installation system will continue, and it will fall into an infinite loop.