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sdio sd card write speed problem

Question asked by shen.cheng on Aug 30, 2013
Latest reply on Sep 5, 2013 by shen.cheng
hi guys i'm new to stm32, i got a problem that i used sdio and fatfs to test maximum speed of write sd card, its only around 330kb/s but when i try to use sd card reader its up to 2mb/s, so i want to figure out why its so different between them and how can i fix it?

(i tried two ways of test: first use f_write function write 10k data once, second separate 10k data into 64byte package to send, result looks similar )

i use dma mode 4bits bus

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