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Maximum Transfer Rate - USB Mass Storage STM32F103 SPI

Question asked by jkwool on Jan 6, 2014
Latest reply on Jan 6, 2014 by jkwool
I am working on a couple of projects that incorporate USB Mass Storage, i am using an STM32F103RB MCU and the micro SD card is connected via SPI.

The maximum transfer rate i am getting is around 85 kB/sec.

I am trying to determine where the bottleneck is. Would there be anything in the USB side of things that would limit the USB Mass Storage data transfer on the STM32F103?

What is the maximum practical data transfer that I could expect over USB for Mass Storage via SPI on the STM32F103?

I have tested various different micro SD cards and they all have the same transfer rate so i am pretty sure the micro sd card is not the bottleneck.