I have two 400k drives from Mac 128k shells. I want to verify their operation. I cleaned them up and lubricated them, the mechanics of them work just fine, but I want to see if they work at all.

Is it possible to use a 400k drive on a Plus? My Plus has an 800k drive in it, I just want to see if these 400k drives work at all.

Edit: Interesting, these drives are dated January 1984 and March 1984. One of the cases the January one came out of must have been an early unit.