AE made a number of different 3.5" drives. I have one of the AE 1.6mb
drives, AE 800k drives and one of the AE Macintosh HD drives. They're
packed away so I can't check the markings on them. I may well be wrong
but it seems to me that the IIGS 1.6mb drives were marked AEHD and the
Mac ones were HD+. The Mac one was meant to connect to an early Mac
that only had 800k drives and with a special driver r/w 1.4mb disks on
their drive.
With the installed GSOS driver I was able to format 1.6mb floppies. I
only used it briefly as having only the single drive I worried that
should the drive fail, I'd have a pile of unreadable floppies. Also
having a superdrive card pretty much eliminated any need for it.