I've successfully put a floppy disk into a Dell
A Dell will not normally come with a bracket to hold the floppy drive in place, so when you try to somehow stick it in, it will have nothing to support its floppy drive structure
Solution, by one from Dell or an authorized reseller of parts, or get one on ebay for about the same price (if not cheaper)
Or you can be cheap like me. I took an ATX metal clip off where the AGP/PCI-e/PCI slots are supposed to have parts sticking out of them. So you have your clip right - which are totally use less unless you like keep old ATX metal clips just for the heck of it. I decided to keep mine...
Anyway, you'll insert the floppy drive to hang loose because you don't have a bracket, make sure the eject button is in place with the eject button on your floppy drive, and make sure a floppy disk can fit in and out of it. Ok, now take the useless ATX metal clip (*um it's not useless anymore now) and run it through the CD/DVD drive's exterior bracket clippings. Then place the hole (drill a hole big enough for a screw to fit) of the clip in sync with the screw holes of the floppy and screw in. Then reinforce the floppy drive with a perpendicular mechanism (or you can take a metal clip and bend it 90 degrees, then drill a hole into your case for a screw insert, and it will support the strcture of the floppy drive, mounting it so that it balances and does not fall off.
Then you got yourself a home made floppy drive. Sound stupid, I'm sure someone out there has tried this before or something similar to this, other than me alone. Oh yeah, anyone get any "ghetto-er" than this?