Well.. I was looking into installing a ROM on my Nexus 5, and I just wondered...
I had a Galaxy S3 before that, and when I installed ROMs on it, I used to copy the ROM zip file to my SD Card, remove everything from my phone's internal memory, and install the ROM from the external SD Card, that way there was NOTHING left on the phone that I previously had.
Now, I want to do the same thing with my Nexus 5, but guess what... It has no external SD Card option :\
What can I do? Is there any way to install a ROM and delete EVERYTHING I had in my phone before?