There is no way to disable photos mac
A full cataloging of the problems with Photos.app would make Leo Tolstoy seem a man of few words. So rather than listing all of its failings, I will summarize that my goal is to simply make it go away, or at least never darken the face of my monitor. Unfortunately, Photos is the friend of a friend who showed up at your party, stayed long after everyone has left, and no matter how pointedly you ask, will not leave and let you go to bed.
For a while, I thought I had managed to at least lock it in the basement where it wouldn't bother me, by offering it a cask of amontillado and typing the following incantation in at the bash prompt. An incantation, mind you that took a quest of epic proportions to uncover because not wanting do deal with this unruly offspring of a drunken COBOL programmer and a Labrador retriever humping your leg seems to be against the Macintologist religion.
defaults -currentHost write com.apple.ImageCapture2 HotPlugActionPath ''
For the most part, the above seemed to work fairly well. I could insert the SD card from my camera, fire up a program that ***** marginally less, and process my photos without Photos.app, jumping up, putting both paws on my chest, slobbering all over my face, then trying to hump my leg.
Tonight, I tried to use tethering with my new camera. I fired up my image processing software, plugged in the cable, and managed to take a couple of photos using the tethering plug in. But, as soon as I left the Space that had my image processing software, there was Photos.app, slobbering in my face and humping my leg again.
Unfortunately, not even
sudo rm -rf /Applications/Photos.app
will put this unruly pile of software dogbreath out of our misery. How do I make it go away, and never, ever come back and bother me again?
Mac Pro, OS X El Capitan (10.11.5), Photos