I have a sacred USB thumb drive with the Windows 10 installer on it. It is sacred because it took me hours to figure out how to make it bootable. If I recall, Microsoft's own tool for _expressly this purpose_ did not work (after having to set up a virtual machine to use it, etc. etc.), and was apparently a known problem.
I think it was WoeUSB that finally worked for me, not plain dd or Rufus or Apple's Boot Camp utility. Ventoy looks impressive, but unfortunately too many tools don't work.
The easiest way to make USB portable is to just copy the contents of the .iso to the stick. That’s basically all that needs to be done.
Not sure why the downvotes for you. I just did this last week and expected to have to jump through a bunch of hoops and download some software that would burn a bootable image to a usb. Nope just format it as NTFS and copy paste the files from the iso.
Although now this is even easier if you commonly are installing a new OS. But for the typical enthusiast that installs a new OS every couple years this solution is overkill.
only works if you are already using windows and therefore can use diskpart/"mark as active", or you are booting from an extended uefi firmware with the appropriate drivers (e.g. dell).
Or use something like rEFInd as intermediary firmware.
> UEFI:NTFS is a generic bootloader, that is designed to allow boot from NTFS or exFAT partitions, in pure UEFI mode, even if your system does not natively support it. This is primarily intended for use with Rufus, but can also be used independently.