Review on 💾 SanDisk Extreme Pro 64GB Class 10 UHS-I 95MB/s Read U3 V30 Micro SD Memory Card - SDSQXXG-064G by David Flores

Since so many SD cards are fake, I do extensive testing on Linux before using the SD card. This card stores 63864569856 bytes (59.5 GiB). Before running any tests, I ran blkdiscard /dev/mmcblk0 to completely wipe the card. I then wrote 63864569856 bytes of pseudo-random data (generated by RC4 stream encryption) to the card and cleared the buffer cache. Finally, I read the data twice without error. This indicates that this is a real 64GB card and not a fake 1GB card that lies about its size. The observed write speed was 63.3 MB/s and the read speed was 74.9 MB/s. So not exactly what is advertised, but still better than most SD cards I have.