Disable Photos auto-import when connecting memory card I use Lightroom and external CF card reader on a MacBook with 10.11.6. Every time I connect a memory card the Photos import dialog pops up, which is quite annoying since its starts reading from the memory card and often locks up. 

How do I disable it globally?
You can disable the auto pop box in iPhotos , In the preference you can turn it off the auto import option. Link