A commentary over at Aximsite called
Important Info. on Secure Digital Card Performance assesses the hundreds of SD card reports submitted by Pros and end-users alike. The results are pretty startling, considering the numbers of "bad" SD cards out there
According to the article, a very large percentage of the bad ones are being made in Taiwan and China.
"Made in Japan
See a pattern? These numbers are not taken from a simple random sample, but they are the best quantitative data we have. In addition to being problem-biased, the sample is also affected by the proportion of types of cards out there—some card sizes and brands are more popular than others, distorting the proportion of card type reported. A true simple random sample would simply take 500 cards of every brand and every size and test them. Obviously certain conclusions cannot be supported at all, especially those related to the sub-populations of various capacity (or brand) cards."