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I have a 64 GB EVO Select U1 SD Card (link). I ran the Raspberry Pi Diagnostics SD Card Speed test on it. The card always fails the random write test by a large margin (the target speed for this test is 500 IOPS. The test reports usually around 100 IOPS for random writes, and sometimes reports as low as 60 IOPS), and it sometimes fails the sequential write test.

Looking at publicly available performance results that include the EVO Plus, the failure seems unexpected. (Discussions online suggest that it is reasonable to expect similar performance from the EVO Plus and Select cards.)

I see that the log with the test results says that sequential write performance may degrade as the SD card is used, and that reformatting it might help. I had been using this card on a Raspberry Pi 3 Model B+, and I recently installed NOOBS Raspbian GNU/Linux 10 (buster) on the card using the Raspberry Pi Imager to use it on my new Raspberry Pi 4. I assume that using the Imager reformatted the card, but I can't confirm this from research for sure.

Do you have any suggestions about why the SD card might be failing the test?

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  • This makes no sense. Why ANYONE would want to inflict NOOBS on a Pi eludes me. You CAN'T install it with Raspberry Pi Imager and it won't reformat the SD Card (again this is pointless).
    – Milliways
    Aug 20, 2020 at 4:30
  • Do you have any suggestions about why the SD card might be failing the test? - perhaps, since you've been using this SD card on a Pi3B+, this has resulted in sequential write performance may degrade as the SD card is used - seems the answer to your question is in your question Aug 20, 2020 at 4:54
  • @Milliways - couldn't noobs be installed using the "Custom image" option in raspberry pi imager? I've never tried, having never understood the reason for noobs Aug 20, 2020 at 4:55
  • @JaromandaX NOOBS is not an image; it's a collection of files which need to be copied.
    – Milliways
    Aug 20, 2020 at 5:00
  • oh, lesson learned @Milliways Aug 20, 2020 at 5:42

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