Review on 📷 SAMSUNG 32GB EVO Plus Class 10 Micro SDHC Card with Adapter - High Speed 80mb/s (MB-MC32DA/AM) by John Clark

I bought two 32GB versions, one in January and one in April, both from Ecozone USA on revenge The first works well, the second is much slower in random access and far below benchmarks published by users. Many people recommend this card for Raspberry Pi as the random read/write performance should be much better than most cards which are usually optimized for sequential access. I tested both cards on a Raspberry Pi 3 using the iozone 4k random read/write tests: Jan card: 8.2-8.3 Mb/s read and 2.6-2.8 Mb/s write. April card: 4.5-4.6 Mb/s reading and 700-900 Mb/s writing As you can see, the reading speed of the last purchased card is almost half that of the first card, and the writing speed is only about a third. This is simply unacceptable. The markings on the back (both made in the Philippines) indicate different production batches: Jan card: mb-mc32d MBMCBGVEQDFW-FApr card: mb-mc32d MBMCBGVEDFCW-PC Obviously something has changed, so if you are using a Raspberry Buy a Pi, definitely test it. Search "pidramble microsd-cards" to learn how to install/run iozone to test the card. I plan to try another card and am considering returning the second card I bought.