https://devzone.nordicsemi.com/f/nordic-q-a/59734/sdk-fatfs-example-disk-initialization-failedHi I&#39;m using the unmodified fatfs example in SDK16 with PCA10040 dev board connected to a Mikroe SD-Click board which is nothing more than a breakout board for microSD cards https://download.mikroe.com/documents/add-on-boards/click/microsd/microsden-USTelligent Community 13Tue, 31 Mar 2020 13:43:00 GMThttps://devzone.nordicsemi.com/thread/242721?ContentTypeID=1Tue, 31 Mar 2020 13:43:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ab20f067-f784-403f-8dc3-b7231fa4f10aNick_RA<p>Hi Kenneth</p> <p>Thanks for the quick reply. The error was 1 - R/W failure, and the problem was sdk_config.h:</p> <p><span>NRF_SPI_DRV_MISO_PULLUP_CFG was set to pull down; change to NRF_GPIO_PIN_NOPULL and it works OK now including writing to the text file.</span></p> <p><span>A couple of things. 1) Is this a bug in the example? Not sure why you&#39;d need pull downs. also 2) Wouldn&#39;t it be helpful to put the error codes in the application logging?</span></p> <p><span></span><span>Anyway, working now thanks.</span></p> <p><span></span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/242699?ContentTypeID=1Tue, 31 Mar 2020 12:37:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:976bdfc8-f554-403a-b709-60319f546b1bKenneth<p>Hello,</p> <p>Is the SD card formatted (FAT32 or FAT)?<br />What is the value &quot;disk_state&quot; has in main.c at the point when the message is printed:&quot;Disk initialization failed.&quot;? <br />(Compare it to the values in DRESULT in the diskio.h file and see if you get any information from that.)<br />What is the flash size on the SD card?</p> <p>Maybe take a look at these cases if they can help:<br /><a href="https://devzone.nordicsemi.com/f/nordic-q-a/57984/can-t-get-fatfs-work-on-sdk-15-3">https://devzone.nordicsemi.com/f/nordic-q-a/57984/can-t-get-fatfs-work-on-sdk-15-3</a>&nbsp;<br /><a href="https://devzone.nordicsemi.com/f/nordic-q-a/50308/using-exfat-micro-sd-card">https://devzone.nordicsemi.com/f/nordic-q-a/50308/using-exfat-micro-sd-card</a>&nbsp;<br /><a href="https://devzone.nordicsemi.com/f/nordic-q-a/42203/sd-card-fatfs-example-not-working-at-low-init-frequency-but-does-work-at-higher-frequencies">https://devzone.nordicsemi.com/f/nordic-q-a/42203/sd-card-fatfs-example-not-working-at-low-init-frequency-but-does-work-at-higher-frequencies</a>&nbsp;<br /><a href="https://devzone.nordicsemi.com/f/nordic-q-a/39501/unable-to-get-fatfs_pca10028-example-from-nrf5_sdk_12-3-0-to-work-on-nrf51822-board">https://devzone.nordicsemi.com/f/nordic-q-a/39501/unable-to-get-fatfs_pca10028-example-from-nrf5_sdk_12-3-0-to-work-on-nrf51822-board</a>&nbsp;<br /><a href="https://devzone.nordicsemi.com/f/nordic-q-a/25951/sd-card-example-not-working-fine">https://devzone.nordicsemi.com/f/nordic-q-a/25951/sd-card-example-not-working-fine</a></p> <p>Kenneth</p><div style="clear:both;"></div>