Actually what amazes me is that when the Mk. 1 empeg came out, you could get it in 2GB, 4GB and 6GB capacities! IIRC

That may be one reason the empeg didn't sell more units. It was ahead of its time in more ways than one (and still is) but the HD manufacturers weren't caught up yet. I remember thinking that a 10GB model would only store a small fraction of my music, and only if I encoded at 128kps. But knowing how easy it was to add a HD was a major factor in me buying one.