My Facebook post from 2 years ago.

If you want to install Windows 7 on pre-2012 Mac computer, then the
only way to do it is with a bootable DVD using the internal DVD drive.
Never mind running to store to purchase the flash drive that all the
instructions and Bootcamp tell you to use. It doesn't work. Neither
does an external DVD drive. If you want to make a bootable DVD from an
ISO, then your best bet is a Windows 7+ PC using the Windows USB-DVD
download tool. Not using the tool will fail. Also, Windows XP is
apparently not 64 bit enough to burn the disk successfully, and the
ISO I burned from the Mac didn't seem to work. Fortunately I had a
Windows 10 laptop. And as far as that internal DVD drive is concerned,
if yours never worked right from the time you bought the Mac (like
mine), or currently doesn't work right, then you are out of luck. I
just had a repair shop order me a new one.

I should add that if Bootcamp refuses to remove XP from your Mac, and
then tells you to boot up in recovery mode to remove the partition,
that this is an easy way to turn your Mac into a very big paperweight.
Likewise if something goes wrong with the bootcamp install, your Mac
may refuse to boot. If this happens to you, don't panic like I did and
spend $65 at a repair shop to get your operating system reinstalled
back to factory settings. It turns out that if you hold ALT (Option)
key on boot up that you get to a boot menu where you can get back to
your operating system.

The only reason I bought a Mac in 2010 was so that I could write
iPhone Apps. Otherwise, I can't see why anyone would want to own one.
The 27 inch iMac is a very beautiful overpriced computer with a pretty
operating system, but I find that operating system clunky and
restrictive to use. Also, I am too dependent on Windows to not have
that as well.

Hello, I'm a PC.

--
Best wishes,

John Coffey

http://www.entertainmentjourney.com