Do I need to enable the unrestricted admin mode to do it? Is formatting and writing ISO to USB really something that requires admin privileges? None of the ISO image burning software I installed works in my current (default) split mode.
No, you can boot into sysmaint mode instead and do it there. Sysmaint mode has full admin permissions. You will probably have to launch the ISO image burning software from a terminal in sysmaint mode.
It is. The same subsystem that allows accessing USB disks also allows accessing internal disks, so if direct disk I/O was allowed to unprivileged applications, anything could read or overwrite any file on the system, which is bad for a number of reasons. It would also allow malware to modify an external drive in such a way that it would try to hack any computer you plugged it into thereafter, by writing malicious filesystem structures to the disk.
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Thank you for taking the time to explain.
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