NRF5340 USB MSC SD card access data is onle 355KB/s

[jgzou]

Hello 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's reading or writing. Is it possible to get a higher data transfer rate?

Regards,

[Simonr]

To determine the exact max transmission you can achieve we need the following information:

SoC: nRF5340

SPI frequency supported by SD card: 16MHz?

SD card model:

RAM disk:

Best regards,

Simon