Between the 3", 3.25", and 3.5", the
3" does seem to be the best.
BUT, THAT isn't what decides what becomes the defacto standard.
Dysan thought that it was software availability.
Tony seems to think that quality is a factor.
I think you misunderstood me. What matters _to me_ is the (design)
quality. I've long since realised that's generally a reason for something
to be non-successful. After all, the IBM PC caught on, as did VHS (in the
latter case, the Philips V2000 system was better designed and better built).
-tony