Long time ago, in a distant galaxy my wife brought and new bigger SD card for his phone, of course I was in charge to copy the data from the old SD to the new SD.

The new SD came with an USB adaptor, I have an eMMC (attached to PCI bus) reader in my laptop so I wondered what would be faster?

TL;DR well, I don't remember I did this like 4 months ago.

/me reading the benchmark results again

Using the same SD card in an USB adaptor on a USB3 port is faster than the same card in an eMMC reader


SD card plugged into an eMMC reader

SD card plugged into an USB3 port