怎么样制作DVD/USBl来安装redhat linux

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Using the ISO to Create a Bootable DVD　　To create (burn) a CD or DVD, write the ISO to the disc on command line using the cdrecord utility.
　　Example:
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[root@host ~]# cdrecord -v -dev='/dev/xxxx' yyyy.iso

　　Where /dev/xxxx is the USB device, and yyyy.iso is a Red Hat Enterprise Linux installation image. Use the command cdrecord --devices to list disc-writing devices and>Using the ISO to create a Bootable USB Drive　　Alternatively, to create bootable USB installation media, write the ISO image to the USB device using the dd utility.
　　Example:
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[root@host ~]# dd if=yyyy.iso of=/dev/xxxx

　　Where /dev/xxxx is the USB device, and yyyy.iso is a Red Hat Enterprise Linux installation image. Use the command fdisk -l to list disk devices and>　　Additional Resources
　　For more information about installing Red Hat Enterprise Linux, see the documentation:
　　Red Hat Enterprise Linux 7 Installation Guide
　　After installing Red Hat Enterprise Linux, see the following for more information:
　　Red Hat Enterprise Linux Documentation