1. Prepare relevant software
1. U disk above 8G
2. UltraISO virtual optical drive (trial version is enough) latest version download address: https://cn.ultraiso.net/xiazai.html Click to download and try it out
3. CentOS7 image: http://isoredirect.centos.org/centos/7/isos/x86_64/CentOS-7-x86_64-DVD-1810.iso
2. Make a USB system disk
2.1 Open the UltraISO window and click "File"-"Open" in the upper left corner.
2.2 Browse to the directory where the image file is stored, select the target file, and click the "Open" button
2.3 Then return to the UltraISO window again, click "Start" in the menu bar and select "Write Hard Disk Image"
2.4 Select the writing mode as "USB-HDD+". If this mode is not used, the computer may not be able to start normally through the USB flash drive.
2.5 Format U disk and write image
2.6 Please wait for a moment, the image file data of the installation system is being written to the USB flash drive.
