Pictures Re: 2.4Mb 5 1/4" floppy drive?

I'm still trying to find out where the 2.4Mb 5 1/4" floppy drives came from. I finally got around to taking some pictures of the 2.4Mb floppy drive. This one <http://home.cfl.rr.com/rigdon14/hit2_4/front.jpg> is a picture of the front. This one <http://home.cfl.rr.com/rigdon14/hit2_4/sled.jpg> is a picture of the plastic sled that it's mounted in. This <http://home.cfl.rr.com/rigdon14/hit2_4/back.jpg> is a picture of the back showing the Hitachi label and the connector that plugs into the system. This <http://home.cfl.rr.com/rigdon14/hit2_4/top.jpg> is a picture of the top of the bare drive. And here <http://home.cfl.rr.com/rigdon14/hit2_4/bottom.jpg> is a picture of the bottom. The sled has IBM PN 25F8398 on it. I've searched Google and IBM's site for the number but didn't find anything. I found these drives in the same pile with some IBM RS/6000 cards. Does anyone know if the RS/6000 uses anything like this?