7k and tyros 2 are rom sounds and not samplers and windows machines and just have 2 track audio playback or recording so the requirements on large space are rather less. 40 gig is rather light for the capabilities of abacus in my opinion. SD playback for instance is aac and thus the space required is only a tenth of that required for wave, at no subjective difference, so again raw GB figures mean little without looking at the exact feature differences involved.