Does anyone know how I can prevent LR5 from springing into action whenever I plug in an external USB drive?
My guess is this is a Windows 7 64 setting, or something deeper still, but I'm asking here first.
From the Lightroom menu: / edit / preferences
In the "general" tab, uncheck the box "show import dialog when memory card is detected".
Thanks, ManiacJoe, that saved me some time.