Some older applications don't support boot partitions this large. IMHO make your Workbench partition smaller - like in the range of 200-400MB. This is plenty of space for Workbench and will save you potential headaches in the future, should you run into programs that don't support larger.
+1, I always keep my WB boot partitions small & tight..no need for massive boot partitions anyhow on Amiga classic or NG
