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Rev

You write "If changing a bios setting from legacy to UEFI " <-- I think that technically, that thing is the UEFI, either set to UEFI mode or to legacy/bios mode. But even in legacy mode it's not called a BIOS. It's a UEFI behaving in a way compatible with a BIOS.
– barlop
Commented Dec 2, 2015 at 22:44
You write "Filesystems like NTFS / FAT / HFS sit at a higher level than you need to troubleshoot just yet." <--- Not really. In fact if i'd have chosen NTFS then it wouldn't work. Not all UEFIs support NTFS, mine doesn't. And also, the requirement of the EFI folder with the file, that's higher level than the file system, and was a necessity for detection.
– barlop
Commented Dec 2, 2015 at 22:47
You write "Legacy OSs require legacy partition table formats, but you mention Windows 8, which has full UEFI / GPT support, so this shouldn't be an issue." <--- The particular OS is actually NOT really an issue, to something more low level like why a USB is or isn't detected.. The OSs with the EFI folder are. But you can get detection with an EFI folder even if you delete the OS.
– barlop
Commented Dec 2, 2015 at 22:49

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