It is very convenient to install a system now. As long as you have a USB flash drive, you can install the system on your computer. The prerequisite for using a U disk to install the system is to write the image file to the U disk so that the system can be installed on the computer. At this time, we can use the UltraISO tool. So how does Win7 use UltraISO to make a U disk boot disk? Today, the editor of Huajun brings you a simple and easy-to-understand solution. I hope you will support and share the carefully selected content. If you like it, hurry up and get it!
The steps are as follows:
1. Right-click the UltraISO icon and "Run as administrator".

2. Open the UltraISO window and click "File" - "Open" in the upper left corner.

3. Browse to the directory where the image file is stored, select the target file, and click the "Open" button.

4. Then return to the UltraISO window again, click "Start" in the menu bar and select "Write Hard Disk Image".

5. Next, click the "Write" button directly in the pop-up window (Note: Select the writing method as "USB-HDD+". If it is not this mode, the computer may not be able to start normally through the USB flash drive.).

6. Please wait for a moment while the image file data of the installation system is being written to the USB flash drive.

7. After the writing is completed, a removable storage device will be created in the computer window.

The above is the content of how to use UltraISO to create a USB boot disk in Win7; UltraISO is a powerful, convenient and practical tool for creating/editing/format conversion of CD image files. It can write image files to the hard disk so that you can make a bootable USB flash drive.