Someone did an amazing job implementing the cubietruck sata speed for armbian.   I am curious as to what was done.  The other day I pulled read 75MB/s(via nautilus ftp) to my main computer from it.  Would perhaps like to apply whatever the fix was to netbsd. 

Which fix? It's easy to improve performance when you do it step by step, start from bottom to top and identify every single factor that affects performance (and there are a lot when it's about slow ARM boards). Everything outlined here, if not feel free to impove the wiki: http://linux-sunxi.org/Sunxi_devices_as_NAS

 

And at the moment you can try what you want but there seems to be a limitation that prevents A20 being capable of exceeding 45 MB/s write speed. But since it's still SATA it's superiour compared to USB (especially when you can't use UASP) since random I/O is way better (that's more important for other workloads -- eg. running databases -- than sequential transfer speeds mostly used in braindead benchmarks)