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How to create a bootable Linux USB drive
(www.zdnet.com)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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I don't remember where, but i read that this method only works because linux distributors "abuse" the ISO format to allow this. If I remember right, it's not possible to use this ISOs on regular disks
Of course the command you provided is right and it's what I use, it's just a fun fact
Yes and no, it's the other way round. The ISOs often are hybrid images which you can burn onto a CD/DVD or dd onto a USB pen drive. Until approximately 10-15 years ago, if I remember correctly, the distributed Linux ISOs where standard not hybrid images, thus you always needed some other program to create bootable USB media.