MicroSD performance test

I have purchased a lot of microSD cards through out the years. Every year they get faster and more storage. I just purchased a new 128GB card to use for CoreELEC testing, so thought I would give my thoughts on which one to purchase. I do a lot of researching since all I have is time.

I use H2testw v1.4 on my Windows PC to run speed test. I keep track of the speeds of my cards, so thought I would post the results here, in case someone is looking to upgrade their card.
Pny 64GB
Writing speed: 44.2 MByte/s
Reading speed: 72.3 MByte/s
Samsung 32GB EVO
Writing speed: 24.9 MByte/s
Reading speed: 66.0 MByte/s
Sandisk Ultra Plus 32GB
Writing speed: 14.1 MByte/s
Reading speed: 76.6 MByte/s
Samsung EVO 64GB
Writing speed: 23.4 MByte/s
Reading speed: 74.7 MByte/s
Kingston 16GB
Writing speed: 12.9 MByte/s
Reading speed: 76.6 MByte/s
Sandisk Ultra 32 GB
Writing speed: 8.85 MByte/s
Reading speed: 37.2 MByte/s
Black card from Beelink
Writing speed: 17.5 MByte/s
Reading speed: 20.3 MByte/s
H2testw v1.4

Sandisk Extreme Pro 64GB
Writing speed: 69.8 MByte/s
Reading speed: 77.1 MByte/s
H2testw v1.4
Samsung Pro 64GB
Writing speed: 31.3 MByte/s
Reading speed: 76.1 MByte/s
H2testw v1.4
Kingston Canvas Go! Plus
Black/Blue 64GB
Writing speed: 72.4 MByte/s
Reading speed: 73.1 MByte/s
Ezviz Mobile camera
Samsung Pro Endurance 64GB
Gray/black band
Writing speed: 31.3 MByte/s
Reading speed: 73.8 MByte/s
H2testw v1.4
Sandisk Extreme Pro 64GB
Writing speed: 70.3 MByte/s
Reading speed: 72.4 MByte/s
H2testw v1.4
Sandisk Extreme 64GB
Writing speed: 56.0 MByte/s
Reading speed: 83.3 MByte/s
Kingston Canvas Go! Plus 128GB
Writing speed: 72.6 MByte/s
Reading speed: 72.2 MByte/s


One thing to keep in mind is that the SD controller on most devices you would run CoreELEC are way slower than a typical USB3.0 card reader, most of them are capped at the speed of the eMMC onboard. On old devices this could be capped at only 22MB/s. Even on new devices this is usually capped at 60MB/s so cards with over 60MB/s R/W on USB card reader will not performance that much better than those with only 60MB/s R/W.

But, the good news is that the random read/write is not capped that much, and you should really pay attention to it when buying/testing cards, even this test did not cover it. A2 mark suggests a good random RW speed but you should always test by yourself. But if you want to go for it blindly, just buy those cards recommended by RasberryPi and Nintendo Switch users, if the card can handle them, then it can surely handle Kodi easily.

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