https://devzone.nordicsemi.com/f/nordic-q-a/83552/sd-card-on-nrf9160dkHi again Nordic. I&#39;m using the sparkfun level shifter: https://www.amazon.com/SparkFun-Level-Shifting-microSD-Breakout/dp/B01CF569VQ together with Sandisk 32gb formatted to FAT32. I&#39;ve tried the fat-fs example and numerous other fixes, such as alteringen-USTelligent Community 13Wed, 12 Jan 2022 01:23:53 GMThttps://devzone.nordicsemi.com/thread/347278?ContentTypeID=1Wed, 12 Jan 2022 01:23:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:28ec3045-9f5b-40f3-bf89-1f5a74bade15nWre<p>Hey, progress! It now detects the card after throwing the switch. It fails on fs_opendir and gives error code for mount point busy. Still, progress. Thank you!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/347270?ContentTypeID=1Tue, 11 Jan 2022 21:43:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:427ad30b-849b-43da-9797-ce23d8b13627nWre<p>Hi! I assumed the vdd-ports were 3V3 but maybe you are on to something here. There is a switch on the nrf9160DK that says VDDIO and has two settings, 3v and 1v8. I will try throwing this switch in the morning. Thanks!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/347267?ContentTypeID=1Tue, 11 Jan 2022 19:30:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bac01c8a-fc35-4826-bb86-4099dffd0687Jupyter1336<p>They are not very active at this moment and time. What voltage are you running on your I/O most sd cards don&#39;t accept 1.8v or only 1.8v after sending 3.3v messages first. Super weird.</p><div style="clear:both;"></div>