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#11
With Windows 10 I've never had to use the bootsect command. I've always just used diskpart:
diskpart
list disk
select disk # <-replace # with the actual number of the USB drive
clean <- make sure you selected the right disk, this will erase it!
create part pri
format fs=fat32 quick
active
exit
exit
Then mount the ISO files and copy the files over. The diskpart commands take less than 1 minute to complete if you have them memorized. Copying the ISO file depends on the speed of your USB port and USB flash drive.