This is a card that I found while browsing through microSD cards on AliExpress. I was curious to know whether there were any sellers selling both fake flash and authentic flash under the same brand name, so I purchased a 16GB and a 2TB card from the same seller. I expected the 2TB card to be fake — but in reality, they were both fake. This card currently hold the record for skimpiest card: at 4GB, it offers just 0.2% of its stated capacity.
Disclaimer: I don’t think Xiaomi had anything to do with this card. I think this is an unlicensed knock-off (hence why “Xiaomi” is in quotes).
Performance metrics were pretty abysmal, with all metrics falling in the bottom 15th percentile (or worse). Performance was good enough to meet the qualifications for the Class 10 mark, but not good enough for the U3 or A1 marks. I’ll throw in my standard disclaimer: my performance tests do not align with those prescribed by the SD standard. Perhaps it would have done better if it had been tested under proper conditions — but I highly doubt it.
On the endurance testing front: this card’s first error was a 15MB-wide data verification error during round 50. This was enough to put it over the 0.1% failure threshold; however, it did quite well after that, going another 9,000 read/write cycles before hitting the 1% failure threshold. Starting in round 17,550, the number of new bad sectors began to accelerate; the card chugged along until round 29,042, when it stopped responding to commands altogether. By this point, about a quarter of the card’s sectors had been flagged as bad; this is close enough that I’ll go ahead and show its progression through the endurance test:
Overall? This card is a knockoff, it had pretty abysmal performance, and it only lasted 49 read/write cycles before hitting the 0.1% failure threshold. Don’t buy these — they’re trash.
June 11, 2025