https://devzone.nordicsemi.com/f/nordic-q-a/44459/micro-sd-card-with-fatfs-sdk-15Thank you for considering my problem! I have maybe have seen a working Micro SD card with the 52840DK, but have not been able to produce it on my board. 52832. I am using the FatFs from SDK 15.3 and merely change the pins to reflect my hardware: scken-USTelligent Community 13Wed, 06 Mar 2019 20:53:18 GMThttps://devzone.nordicsemi.com/thread/174668?ContentTypeID=1Wed, 06 Mar 2019 20:53:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:72845ed8-c27e-49f0-9692-07f4dfc1bf0bCy<p>I was writing to the uSD card with 8Mhz and the card was a class 4 device, meaning it is rated at 4MHz writes.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/174605?ContentTypeID=1Wed, 06 Mar 2019 14:26:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:33682887-28fa-4dcf-8c87-972f37df7fe6Cy<p>Well, that is certainly possible, the micro SD holder is prominent on the left. The connection from the top as I understand it is: P2, P3, GND, P4, 3V3, P5, P6 and P7. When I the card is engaged the notch is toward the bottom of the image. The uSD card would then be attached as follows:&nbsp;</p> <p><img alt=" " src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/USD_5F00_schem.png" /></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/174567?ContentTypeID=1Wed, 06 Mar 2019 13:20:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:61f1fa70-08fb-4a4b-a1e9-124764336f05Einar Thorsrud<p>Hi,</p> <p>How have you connected the SD card? Could it be that you have crossed the MISO and MOSI pins?</p><div style="clear:both;"></div>