The path the poster asked for should work on any device with an internal storage area, whether rooted or not, so it shouldn't be necessary to mention KitKat.
Android 4.0 through 4.4.2 by default prohibit apps from writing directly to the MicroSD card. Users running Android 5.0 should not have this limitation. A rooted user can easily fix this by downloading the app "SDCardFix" from the Play Store and running it. The app in question edits the vold.fstab system file to enable write access. Someone with a text editor can do the same without the app. I suspect the poster asking for the internal storage space is either not rooted or did not know about enabling write access to the MicroSD card.