Is there any way to check SD card class and other specs in linux / windows? I mean read/write speed, serial, class, etc. I amd seeking a way to determine these, specially the 'class'.


2 Answers 2


It may be written on the card. You can use the programs below to test.

Windows: h2testw

Linux: F3

Source: How do I check the class of a micro sd card?

  • Please note that it is possible that the card reader be misconfigured or be a slow reader. In my case for example I have a fast card that reaches 80MB/s read in Windows but for some reason Linux would only read at 10MB/s.
    – Rolf
    Commented Apr 18, 2018 at 21:44

This is not information about the SD card per se, but it will show how the reader has configured itself for card access (frequency, voltage, timings)

sudo cat /sys/kernel/debug/mmc0/ios

This is for Linux. Hopefully it would have configured itself properly.

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