Read speeds of microSD slot and eMMC

[bartgrefte]

I am not sure dd is that useful for benchmarking.

Well, that's what Google came up with when I googled for ways to measure eMMC read speeds.

bs=64 cannot be expected to report any meaningful maximum unless that is your specific use case. From your results it can be easily deduced that the throughput bears little relation to the media which is a bad benchmark if you are trying to compare media. When dumping a 1G file bs=4M is my preference but I still wouldn't use dd to benchmark.

Just tried it with bs=4M, that's showing better read speeds: ~57MBps.