Originally posted by jzimages I have two brand new Samsung 64GB cards 80/40 read/write speeds - and they both have created the "card is not formatted" messeage on my Pentax K5s camera in the past couple days - lost a lot of imaged and am afraid to use them now - at $50 a piece they are not exactly "consumables" is there a problem with the camera or the cards??
This is sort of a zombie thread (last post about nine month ago). I have always found it best to use the camera's format feature. If that fails, you know there is an issue with the card or your camera's ability to use it. If a card fails after being read by your computer, I would suggest setting the write-protect tab. If that is not acceptable, you might want to make sure the card has done a clean "unmount" before pulling it from the reader. Not doing so can corrupt the file system and make the card unusable to the next device.
BTW...I always do an in-camera reformat rather than erase to remove files from the card.
Steve