Originally Posted by JetPlaneFlyer
Thanks for the pointers. I think the reason i didn't get the errors in my bench testing was purely because i didn't shoot long enough test videos for the errors to show. I just tried a 15 min test video and sure enough i got a corrupt file. The file cant be recovered.
I'm now sure it's the micro SD that's the problem.. It's a no name generic sourced from eBay. As check I tried a Sandisk SD (borrowed from my phone) and even though it was only class 2 the videos came out fine, no corruption. So on your recommendation I just went and ordered a Class 10 Transcend card.
Also trying a format of the old generic card with SD Formatter, but I'm not optimistic.
OK... good you found the problem. After you reformat it, run the H2testw utility to check the memory... it will show how much valid memory is on the card, detect errors, and give average sequential write speed. Generic eBay cards from eBay should be avoided at all cost... many are rejects.