I'm trying to connect a microSD card connector to my project (Molex 502774) and am slightly confused by the extra pins (nails?) provided. One of them is marked DETECT NAIL and the other one is SWITCH NAIL. As I understand the DETECT NAIL is for detecting when the card is inside – it is shorted to ground when card is inserted and should be connected to an input with a pull-up resistor.
But what is the SWITCH NAIL for? Does it have anything to do with card hot-swapping?
Looking at the drawing, I would guess that DETECT and SWITCH are the two terminals of the switch which detects the presence of an SD-card. This allows for more flexibility in circuit design