Superdrive controller + superdrive = read MSDOS? Doesn't work for me

["Tim Haynes" <trhaynes.NOSPAM.PLEASE@yahoo.com>]

I recently bought a superdrive controller for my IIgs.  I modified a drive
to take the Superdrive mechanism from a Mac IIsi (knew that thing would be
good for something someday... ;) and updated my GSOS 6.0.1 with the Apple
3.5 Disk installer so that it could format 1.44 meg disks.  So far, so good!
Works fine with 1.44 meg PRODOS disks.  I then installed the MSDOS FST and
rebooted.  I checked the FSTs folder and the MSDOS one is there.  But when I
put in a formatted MSDOS disk, nothing happens.  The disk light comes on
momentarily, but no disk shows up on the desktop and no message is
displayed.

Am I doing something wrong...?

Thanks
Tim