Okay but...regarding Linux, let's assume that I'm succeeded in copying EVERY files (hidden files, and system files too, etc..) on ly Linux distrib.
Is it false to affirm that "nothing missed me".
so if I burn a CD, I will get ALL my Linux Files after the burning process.
Is that correct ? If so, I don't see the interest to have an iso file.

Yes, copying every file will work. You're not required to use ISO files, and can follow your own process. An ISO file is one way to distribute a version of Linux. Just because you don't see the point or have any interest yourself in using that format does not mean that others are prohibited from using that format. You are also welcome to offer an equivalent alternative for possible adoption by everyone.

I'm reading his question differently.

You can not easily take a hard drive install and put it on a cd/dvd. You need to change it. There are many how to web pages on ways to mkiso and make it bootable.

Generally the steps to create a cd/dvd or usb image are to make a working directory where you can copy your files, you then add in cd/dvd special programs and edits. Might then compress the image to get it faster and fit the cd/dvd. May have to work on loader and path and driver.

Some app out there might be able to master this. Remastersys maybe.

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