https://devzone.nordicsemi.com/f/nordic-q-a/89853/nrf5340-usb-msc-sd-card-access-data-is-onle-355kb-sHello Nordic support, I am using the zephyr\samples\subsys\usb\mass example with an SD card. SPIM4 work on 16MHz.When I check this example on a Windows 11 machine, I observe data transfer rate of 355 Kbps,whether it&#39;s reading or writing. Is it possibleen-USTelligent Community 13Thu, 18 Aug 2022 07:56:34 GMThttps://devzone.nordicsemi.com/thread/382159?ContentTypeID=1Thu, 18 Aug 2022 07:56:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e94974b5-c23f-4641-bedb-67ed1dc2e4ffSimonr<p>To determine the exact max transmission you can achieve we need the following information:</p> <p>SoC: nRF5340</p> <p>SPI frequency supported by SD card: 16MHz?</p> <p>SD card model:</p> <p>RAM disk:</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/376531?ContentTypeID=1Tue, 12 Jul 2022 06:37:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e5d98a5a-60f4-4db0-b767-aaeff6cfbf47Simonr<p>Hi</p> <p>It is possible, yes, but not very easy. ~355 kbps is approximately what you can expect from the standard USB MSC example. To increase this throughput it will require that you read from the SD card and write to USB at the same time, requiring a rather complicated buffering solution. The maximum transmission will be ~1Mbps (3 times what you&#39;re currently doing).</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>