Creating ISO files and hybrid ISO

An ISO image is an archive format that stores the exact storage images of optical disks such as CD-ROM, DVD-ROM, and so on. ISO files are commonly used to store content to be burned to optical media. We will now see how to create an ISO image from an optical disk. Many people rely on third-party utilities to do this, but using the command line, it's even simpler.

We also need to distinguish between bootable and non-bootable optical disks. Bootable disks are capable of booting from themselves and also running an operating system or another product. Non-bootable ISOs cannot do that. The important thing to note here is that just copying files from a bootable CD-ROM to another one is not sufficient to make the new one bootable. To preserve the bootable nature of a CD-ROM, it should be copied as a disk image using an ISO file.

Nowadays, most people use devices such as flash drives or hard disks as a replacement for optical disks. When we write a bootable ISO to...