Alternative: Also there is a possibility that the SD card shows a bigger size than it actually is. In example it might show up as 32GB but in reality it is just 8GB. These scam cards were sold (or still are) for cheaper price and look like a normal card. When you write stuff on it, then it just looks like it will write data, but after the (let’s say) 8GB real size, anything goes into thin air. Checking for errors will not find anything there, as the sectors would be fine or falsely simulated to be fine via its firmware.