https://devzone.nordicsemi.com/f/nordic-q-a/122601/can-only-mount-and-write-in-the-address-range-from-0x00---0x0200000-2mb-on-w25q128jvI&#39;m writing a wav file from the nrf52840 board to the nor flash w25q128jv with a capacity of 16mb but it seems that I can only operate on the first 2mb, even when dividing the partition, if the starting address is over 2mb, the file mount will fail, anden-USTelligent Community 13Tue, 01 Jul 2025 09:10:10 GMThttps://devzone.nordicsemi.com/thread/540998?ContentTypeID=1Tue, 01 Jul 2025 09:10:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:109ee9dc-38ec-4a29-bc47-930fc5fa3ae2Hung Bui<p>Great. I&#39;m glad that it work. Happy coding!&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/540945?ContentTypeID=1Tue, 01 Jul 2025 00:42:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f3f21a9e-82ae-4c28-b270-c834a85994f6LeDucTai<p>Hi Hung,</p> <p>Thank you so much for the reply, this is exactly the error i am having.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/540939?ContentTypeID=1Mon, 30 Jun 2025 21:50:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f82ba62c-4697-4914-8d50-9d37936a4f4cHung Bui<p>Hi Tai,&nbsp;<br />I&#39;m sorry for the late reply.&nbsp;</p> <p>I think I may know what&#39;s wrong here. The size of the SPI flash is count in mega bit :)&nbsp;<br />You can see the name of your flash is&nbsp;<span>w25q<strong>128</strong>jv.&nbsp;<br />So the size in&nbsp;mx25r6435f: w25q128jv@0 {&nbsp; should not be&nbsp;<br /><br />size = &lt;0x1000000&gt;&nbsp;</span></p> <p><span><br />Instead it should be&nbsp;<br />size = &lt;134217728&gt;;<br />or&nbsp;<br /></span><span>size = &lt;0x8000000&gt;;</span></p> <p>This explains why you can not access anything above 2MB because 2MB = 16 Mbit . You were setting the size of your flash to 16Mb instead of 128Mb (16MB).</p><div style="clear:both;"></div>