One card says there is 29.71 GB, the other card says 0 bytes used or free, guessing that one is no good. I already went to that link you suggested, that is how I got here. The card is recognized by my tablet and I thought stuff was being downloaded until I checked it yesterday, nothing on it but it said 29.71 GB free, same as putting on my laptop. Tried the normal format, windows cannot format, went to google and clicked on many links, downloaded the formatter, seemed to format for about 30 minutes and then a window popped up saying windows could not format. I even tried copying various items from my laptop, said the disc is write-protected and could not be copied, something to that effect. Currently using a Windows 7 laptop and I also have a Windows XP laptop, tried the cards on both, same readings. No idea what to do now except probably just return them on try again. I have formatted other discs before, no problem. Not these two. Very strange.