https://devzone.nordicsemi.com/f/nordic-q-a/43518/load-an-external-qspi-flash-with-initial-dataHello guys, Just wanted to ask a short question about the following: On our custom board we have nRF52840 device with 1Gb (128MB) external QSPI flash memory. What would be the best and more efficient way to initially load data (about 110MB) intoen-USTelligent Community 13Mon, 11 Feb 2019 16:09:44 GMThttps://devzone.nordicsemi.com/thread/170437?ContentTypeID=1Mon, 11 Feb 2019 16:09:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ae4198b2-5a43-4b02-a3a8-cd90cd39b678J&#248;rgen Holmefjord<p>Hi,</p> <p>I think you would be able to achieve similar speeds with both options.</p> <p>One of our developers have achieved <a href="https://devzone.nordicsemi.com/f/nordic-q-a/22336/nrf52840-usb-msd-slow-write-speed/87825#87825">~700 KB/s during testing with USB MSC example</a>. The SWD interface of nRF52840 have a <a href="https://www.nordicsemi.com/DocLib/Content/Product_Spec/nRF52840/latest/dif?113#unique_381570429">maximum specification of 8 MHz frequency on SWDCLK pin</a>.</p> <p>Note that to utilize frequency of 8 MHz on SWD interface, you will have to use a <a href="https://www.segger.com/products/debug-probes/j-link/models/model-overview/">J-Link model</a> that support this high frequency. The J-Link OB on the DK (<a href="https://www.segger.com/products/debug-probes/j-link/models/j-link-ob/">ATSAM3U2C</a>) is only rated at 3.2 MHz.</p> <p>Best regards,<br />Jørgen</p><div style="clear:both;"></div>