Is there a way to attach another microSD slot to the Raspberry Pi 3? I have searched online for shields or breakouts that can be attached to the pins but have only found solutions for microcontrollers such as Arduino. An alternative is the use of a USB Cardreader, but I want to know if additional slots using pins are possible.
I was considering using one of those microSD breakouts with the pins on the RPi3, but I'm worried about the sensitivity of the signal lines because of previous breadboarding nightmares:
Are these the only options I have?