A random post about the speed of SD cardreaders

Sometimes you have those epiphany moments that you realize Aha! This was a tiny one that I like to share. I recently bought two Samsung EVO Plus 128GB microSD cards and found them rather sluggish, so I tested them with CrystalDiskMark. This is what it looked:

CrystalDiskMark results with Samsung Evo Plus 128GB microSD in combination with build-in Sandisk SDDR-113 SD cardreader

Well, that’s surely not what I expected. As the build-in microSD cardreader of my Lenovo X1 is located as inconvenient as it could be, I always used my Sandisk SDDR-113 cardreader instead. That Sandisk is an old one with USB 2.0 but still, I would expect to get 50 – 60MB/sec.
After going through the pain of putting the microSD card in the cardreader of my Lenovo X1 I got the following result:

CrystalDiskMark results with Samsung Evo Plus 128GB microSD in combination with build-in microSD card reader in Lenovo X1 (Realtek RTS525A)

That’s a significant improvement! So, are you unhappy with the performance of your SD card? Remember it doesn’t necessarily have to be the card that is slow. Don’t forget the effect of your cardreader.

A little bonus: one more test, same microSD card, another cardreader.

CrystalDiskMark results with Samsung Evo Plus 128GB microSD in combination with build-in SD card reader in HP Probook 6550b (Ricoh R5U822 driver)

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