Be careful! Make sure you don’t confuse the Unidisk 5.25” Drive with the Apple 5.25” Drive. I have the Apple 5.25” Drive.
And no, you can’t use your Apple 5.25” Drive to read IBM 5.25” floppy disks. The capacity of IBM 5.25” floppy disks is too high.
20160104/http://vintagemacworld.com/drives.html 20160104/https://en.wikipedia.org/wiki/Floppy_disk 20160104/https://en.wikipedia.org/wiki/List_of_floppy_disk_formats