Thanks for both!
(I did know already that there's a menu option for safe remove, but I wasn't so sure that during the process of shutting down the Android OS it will do the same...)
I'm hesitating between whether to buy an external USB or an internal HDD to the Q10 Pro. Mainly for sharing and storing video and music, but I lean towards to get an external one, since is very practical to have it mobile ready anytime I try to move it to connect directly to any of my home computers. But I guess copying files to and from an external (USB 3.0) one still would be much more slower, than with an internal HDD.
Any pros or contras you would mention regarding whichever may I go for?!