UNetbootin is a free bootable USB creator software.
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The fact that UNetbootin is cross platform means it can be used on any computer one has lying around, to create a bootable USB stick from a proper ISO file. It also makes it more viable as a tool since it can be recommended to anyone without having to worry about what operating system they are running.
Pro Automatically detects USB flash drives
UNetbootin automatically detects all the USB drives in the computer, this helps the interface be much more fluid, and protects inexperienced users from accidentally corrupting their hard drive.
Pro Supports most common distros for download
Although you can override this setting by selecting any ISO file of your choice, UNetbootin offers a simple interface in which you can choose to automatically download almost any mainstream operating system. This can save users the hassle of browsing through web pages in search of a download.
Con There's a chance it will destroy your USB
Not only is the performance of the software subpar, there is a high likelihood that it will corrupt your USB in the process.
Con Might not work sometimes
For example UNetbootin has some troubles with the Hiren's Boot CD ISO file.