You should not need to "expand" a SCSI controller on an Amiga. The 2091 used in the A2000 HD supports 7 devices unlike IDE that supports 2. You only have to make sure each scsi device has a differnt SCSI id (set up usually by jumpers on the device). Even external SCSI diveces are supported, like Scanners and external CR_Roms and Zip and Jaz drives. :-D
