Yes, that makes sense. The SDCard port on the pi seems to be slower than the USB bus. I will say that I think your estimate for the USB bus on the pi is probab

Yes, that makes sense. The SDCard port on the pi seems to be slower than the USB bus. I will say that I think your estimate for the USB bus on the pi is probably too high. In practice, I don't think it can do more than 250 or so.