Aside from experience... Look for a large single black IC chip. Those are cd/DVD boards. The only place I've come across where a cd/DVD board goes for anything else is plextor drives which some have boards that go telco. But they're easy to tell because they look like large hard drive boards, lots of CMCs ICs etc and have two large square DVD controller chips.
You can't judge by port alone; many hard drives, optical drives and many many tape drives use scsi
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