https://devzone.nordicsemi.com/f/nordic-q-a/13640/nrf51-flash-write-erase-fails-with-success-statusHello, Our device based on nRF51822 with SD110 v.8.0.0. The firmware use defined area in top of the flash to store some data. The &quot;RAW&quot; functions sd_flash_write and sd_flash_page_erase are used for flash write and erase operations correspondinglyen-USTelligent Community 13Wed, 04 May 2016 11:07:51 GMThttps://devzone.nordicsemi.com/thread/52110?ContentTypeID=1Wed, 04 May 2016 11:07:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f20748cc-11a9-4cbc-9aba-2f0673148ff3Valer_I<p>Thank you, now it clear.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/52109?ContentTypeID=1Wed, 04 May 2016 10:27:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:af4ae732-b7a3-4c7e-9a07-2ef761ca36bcKenneth<p>Hi, I believe this is already described in the nRF52 PS about <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.0/power.html?cp=1_3_0_16_3_0#unique_200645189">Power-fail comparator</a>:</p> <p>&quot;If power-fail warning is enabled and the supply voltage is below VPOF the power-fail comparator will prevent the NVMC from performing write operations to the NVM.&quot;</p> <p>The workaround can be to disable the POF warning before flash operations, and enable it again afterwards.</p><div style="clear:both;"></div>