It's an internal one that came from another SE/30 I got off eBay because I thought the one I had had a fried SCSI chip, when in fact all the drives I had were fried instead.

I'm not sure how cleaning a floppy drive head with a dry q-tip gently destroys it. I tried formatting disks, it gets about 3/4 the way through then *euunk eeeunnnk* and rejects the floppy as defective. No trusted floppies mount or read.