That works! Tested on i.mx25 architecture with sdhci-esdhc-imx driver. Here are some time measurements. #time dd if=/dev/zero of=test bs=1MB count=1 real 0m0.614s user 0m0.000s sys 0m0.132s #time dd if=/dev/zero of=test bs=1MB count=4 real 0m1.328s user 0m0.000s sys 0m0.390s #time dd if=/dev/zero of=test bs=1MB count=8 real 0m3.922s user 0m0.000s sys 0m0.747s #time dd if=/dev/zero of=test bs=1MB count=16 real 0m8.162s user 0m0.009s sys 0m1.419s #time dd if=/dev/zero of=test bs=1MB count=32 real 0m15.725s user 0m0.000s sys 0m2.758s Thanks for the help. Kind regards, Benjamin Beckmeyer -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html