On counterfeit SD cards

[zer0sig]

Addition: It's also worth noting that smaller cards are less likely to be fakes because they're easier to test.
A testing a 16-gigabyte card requires 16 gigabytes of test data, which is relatively easy to generate and handle. Testing a 1-terabyte card requires one terabyte of test data, which is rather a lot, and most people won't have the free storage space (I know I don't) or the time to complete a proper test. When you can identify a fake in a few minutes with your laptop, it's much harder to get away with shenanigans compared to when it takes hours and a proper workstation.

I've generally had good luck with SDs but we built a server at work on an SD card (so we could dedicate disk arrays for data/NAS) and it failed. Card felt weird and flexy and looks different from another. We have a few more servers running these cards without a hiccup, so it looks like just one made it through. And it was from Amazon, and I believe from a reputable seller or maybe straight from either Amazon/Sandisk. When it failed, it wasn't readable at all.

Note that if you have a Linux/Unix type machine with a command line, there are various checks you can do that don't require very large files. dd is one and is standard on every Unix type system I can think of (not certain whether it is stock in Mac OS/X but I'm pretty cerrtain it's available), and there are some specific utilities for this sort of thing. Check out this link: https://askubuntu.com/questions/737473/c...humb-drive