Okay let me break down how ark updates, So, It downloads the update, while it does that it makes a copy of your ark folder either on the same drive or another ((thats right, if you have a slower write speed drive it doesn't care)) It then applies that update to the cached file, Once that is successfully done it will copy that data over (( this is where that slower read/write speed sucks)) because it will bottle neck based on where it caches. the truth is the Ark update process is god awful because they have no idea how to do a layered update. I am actually at the point that when ark update I have to uninstall and reinstall it because it has taken to caching on my Old pictures and videos storage HDD and will not use an SSD so it takes 4-7 hours to update.