Personally I found an easy way to tell - write a script which fills the drive fully with random data (computing a check sum as it writes), then read it all back and verify you get the right checksum.
Oh and compute read/write times while doing so.
If the read back data doesn’t validate, or you can’t write the amount expected, or the read/write rates don’t match expected? faaaaaaake
Pretty accurate too. I personally never had an actual fake Sandisk SD card from Amazon. I bought probably 50 of them in the space of 6 months at one point. Other brands were not great.
USB flash drives though? Literally all trash. I tried at least 5 different ones before I just gave up.
Oh and compute read/write times while doing so.
If the read back data doesn’t validate, or you can’t write the amount expected, or the read/write rates don’t match expected? faaaaaaake
Pretty accurate too. I personally never had an actual fake Sandisk SD card from Amazon. I bought probably 50 of them in the space of 6 months at one point. Other brands were not great.
USB flash drives though? Literally all trash. I tried at least 5 different ones before I just gave up.
No idea what the market looks like now however.