FIXED! SD Card Won't Snap in Place or Stay In? TRY THIS!!

TF card is the name that SanDisk usually uses for its micro-secure digital card and is considered to be the world's smallest

A TF slot is essentially a microSD opening Once the card enters the slot, the device will detect it and use it to save data like videos,

tf card slot meaning TF stands for TransFlash, while Micro SD stands for micro Secure Digital Both acronyms refer to the same tiny type of memory card used in smartphones,

tf karten slot basically the error message means that your arduino couldnt communicate with the SD reader properly Micro SD TF Memory Card Reader Module with SPI interface