I cannot seem to find an official source for it, but it appears that "UDF" if copied verbatim, cannot be booted from USB. Maybe it's some special Dell limitation they can only boot on USB if it's FAT32? Why would it not boot from straight UDF? Update: I ran the OS X "Boot Camp Assistant" (check the box "Create a Windows 7 or later version install disk" and gave it the same ISO file), then it magically boot fine (appears to be formatted FAT32). The created USB is readable in OS X, but in other windows boxes, it just says "You need to format the disk in Drive E: before you can use it." So it doesn't boot, nor can windows read it. No boot device available - strike F1 to retry boot. Then plug it into my dell optiplex 780 (a little old, I know), enable booting from USB device in the BIOS, and choose it, and all I get is: I then copy it "straight" to my USB drive, like: The iso is mountable in OS X as a "UDF" format. I am using a windows "standard" ISO file: Win10_1511_1_English_圆4.iso and I have verified its md5 matches the expected.
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