This may be the worst memory card I've ever purchased - and I have bought a lot of card over the years - wish I had just stuck with my ADATA cardsFirst issue - I lost a bunch of photos - they just did not exist at all - it was as if I never took them  - but since there was a large gap in the file names I know for sure I didOf 200 photos taken about 40 in the middle just disappearedi could not even recover them using a deep scan toolI've been shooting digital since the mid 90s and this is the first time anything like this has ever happenedThen there is the cheesy SD adapter - the switch was so loose it switched to locked while I was taking pictures.Luckily the camera warned me that the card was read only - after having already taken a bunch of shots that has saved without issueFinally I figured I could just use these in my Samsung phones - no such luck - the second I put them in and took a photo I got an error that it could not right to the card and I could no longer see the 8gig of photos that were on itYes this may be a know issue with the cards - I see a review mentioned that - and I see that SanDisk will replace them - but they cannot replace the photos I lost - so keep that in mind when considering this card - I will