Review on 📷 KOOTION 32GB Micro SD Card 2-Pack - High Speed Class 10 Micro SDHC Memory Card - UHS-I TF Card with Ultra High Speed Performance - C10, U1 - 32 GB Capacity for Enhanced Storage by Joseph Morris

I tried three of these cards in three different Linux single board computers. Orange Pi Zero, Orange Pi i96 and Raspberry Pi. All three cards had problems. Slow writing, slow reading and bad writing. The last one is a kicker. Data corruption after writing. Tests on Raspberry Pi and Orange Pi Zero show problems. Tested again on a much older SANDisk card, no errors, significantly faster write and read speeds. SANDisk: 4K Random Write Speed: 3163 KB/s : 4K Random Write Speed: 190 KB/s Don't buy it for free. They also don't match your phone. Here is part of the Orange PI Zero test results for the KOOTION card: Copyright (C) 2010 Digirati Internet LTDA. This is free software; see source of copy conditions. SECTORS good/damaged/changed/overwrittenChecking the 1.h2w file. 2097152/ 0/ 0/ 0 Checking file 2.h2w . 2097152/ 0/ 0/ 0 Checking the 3.h2w file. 2097152/ 0/ 0/ 0 Checking file 4.h2w . 2096128/ 256/ 0/ 768 Check file 5.h2w . 2097152/ 0/ 0/ 0 Checking file 6.h2w . 2095646/410/0/1096 Checking the 7.h2w file. 2097152/ 0/ 0/ 0 Checking file 8.h2w . 2097152/ 0/ 0/ 0 Checking file 9.h2w . 2097152/ 0/ 0/ 0 Checking the 10.h2w file. 2097152/0/0/0 Checking file 11.h2w. 2097152/ 0/ 0/ 0 Checking the 12.h2w file. 2097152/ 0/ 0/ 0 Checking file 13.h2w . 2097152/ 0/ 0/ 0 Checking the 14.h2w file. 2097152/ 0/ 0/ 0 Checking file 15.h2w . 2097152/ 0/ 0/ 0 Checking file 16.h2w . 2087360/ 2448/ 0/ 7344 Check file 17.h2w . 2097152/ 0/ 0/ 0 Checking file 18.h2w . 2097152/ 0/ 0/ 0 Checking file 19.h2w . 2097152/ 0/ 0/ 0 Checking file 20.h2w . 2097152/ 0/ 0/ 0 Checking file 21.h2w . 2097152/ 0/ 0/ 0 Checking file 22.h2w . 2097152/ 0/ 0/ 0 Checking file 23.h2w . 2097152/ 0/ 0/ 0 Checking file 24.h2w . 2097152/ 0/ 0/ 0 Checking file 25.h2w . 2097152/ 0/ 0/ 0 Checking file 26.h2w . 2097152/ 0/ 0/ 0 Checking file 27.h2w . 1976168/ 0/ 0/ 0 Data OK: 26.94 GB (56489798 sectors) Data LOST: 6.02 MB (12322 sectors) Corrupted: 1.52 MB (3114 sectors) Slightly modified: 0.00 bytes (0 sectors) Overwritten: 4.50 MB (9208 sectors) Average read speed: 20.66 MB/s. Health Summary: Error /dev/mmcblk0p1. Replace it as soon as possible Data Lost: 6.02 MB (12322 sectors) Corrupted: 1.52 MB (3114 sectors) Slightly Modified: 0.00 bytes (0 sectors) Overwritten: 4.50 MB (9208 sectors) Performance Summary : Sequential read speed: 20.66 MB/s 4K random read speed: 4474 KB/s Sequential write speed: 9.44 MB/s 4K random write speed: 190 KB/s (too slow)