How to make win7u disk startup disk?

First of all, let's use UltraISO to open the downloaded Win7 system ISO file.

UltraISO making win7u disk boot disk Step one

UltraISO making win7u Disk boot disk Step two

Next select the Start button → write to the hard disk image, at this time to ensure that U disk or mobile hard drive has been plugged in.

UltraISO making win7u disk boot disk step three

In the pop-up dialog box to choose to back up the boot U disk or mobile hard drive, if there is data need to be backed up in advance and then choose Format, if the empty can be directly clicked 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 you have learned how to create a Win7 system can be installed on the U disk boot disk. When installing the system, simply turn it into a USB HDD boot in the BIOS. Note here, in the installation process, the first reboot of the system requires that the boot to start the hard drive, otherwise it will continue to default U disk installation system, into a dead loop.