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On the capacity, performance, and reliability of microSD cards

Or: What are the best microSD cards you can get for under $15 in 2024 2025? If you just want to see my top picks, skip to the Overall Picks section. If you just want to see the raw data, click here. If you want to read in more detail about how I...

Of course, the other explanation is that this behavior is accidental — for example, the portion of flash memory where the card stores its write-protect flags could become corrupted, causing it to report that it is write protected. In my tests, it did better than average across all performance metrics, and did exceedingly well for write speeds — making it an excellent fit for write-intensive applications, such as high definition video recording and embedded systems like a Raspberry Pi. A possible follow-up experiment would be to perform an endurance test where the card is overwritten, then placed in storage for a certain amount of time, then read back and compared to the original data written.

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