Unfortunately the 2.05 roms in some A600s have limited or no hd support at all. Although My a600 had 37.300 roms and it worked fine with a 260Mb drive for a while then the drive failed and I replaced it with a 80Mb one. To this day I'm not sure if the drive was faulty or the roms didn't like it, I think it was the drive though.
Theres a little info here:
http://www.gregdonner.org/workbench/wb_205.html
