2019-08-10, 00:49
I don't know, did not try all combinations. Fastest media is eMMC, then USB3.0 and uSD is slowest.
What I know: Android cannot boot from USB so it has to be installed on uSD or eMMC; CE can boot from USB, but I have not tried to install it from USB, so don't know if it works; I used USB to uSD adapter with my uSD card CE installation to run it from USB3.0 ports when I tested multi-boot. I had CE on USB(uSD), Ubuntu on uSD and Android on eMMC.
What I know: Android cannot boot from USB so it has to be installed on uSD or eMMC; CE can boot from USB, but I have not tried to install it from USB, so don't know if it works; I used USB to uSD adapter with my uSD card CE installation to run it from USB3.0 ports when I tested multi-boot. I had CE on USB(uSD), Ubuntu on uSD and Android on eMMC.