Hello, I have had experience with a Nexus S and Galaxy Nexus, while skipping the Nexus 4 to try out the SG3, I have returned to the Google Experience.
I remember having partitioned the S and GS to have an Internal Memory, thus also allowing me to ADB push to its home, as well as being able to drag NDBackups to my computer.
With the Nexus 5, part one was unlock, recovery, and root. I have successfully done so, though having to mess with directories to grab SuperUser for some reason- this should not have affected /sd card.
I could not successfully adb push SU.zip/ sdcard, and
a)view /sdcard on my pc
b)install zip from SDcard and see the file, there was /0 /legacy and /oob
I have googled, I have searched to the best of my keywording abilities, and find answers on Why Nexus doesnt have sd articles, and other things like Nexus 4 and 7 results that don't help.
So if anyone would mind, giving me instructions to create or open the partition, I would appreciate it.