The most recent Sony full-frame mirrorless cameras have two memory card slots. This allows you to set up your cards in various ways. For example you can have your Sony A7 III write to both cards, or use slot 2 to record just certain types of files.
In this article, I’m going to guide you through all the settings, what they mean and how to configure the Sony A7 series dual card slot. If you want to know which cards I recommend for your A7 / A9 model, check out our dedicated article below.