Please reply when you discovered a new -working-
device reside the following:
HD:
Apple M-2620 (20Mb) M-2644 (40Mb) M-2688 (80Mb).
CMS Entercements, Inc. CMS SD-20 (20Mb) SD-80 (80Mb)
CMS Microtech / MicroNet / Eltekon Dynatek
---Try formatting any <80MB HD as Apple HFS and try again---
Removeables:
Syquest 44MB/105MB/135MB (will be 80MB formatted)
CD-ROM Drives (1x read):
Roland CD-5, Sony CDU-6111 or CDU-800x or CDU-541

---Will be continued---

A Syquest 88MB also works.

My experience so far is, that all IDE HDDs are working, but only 80MB are used. But of course I didn't try all HDDs on the market ;-)