I've been using 32 GB SDHC card on my canon EOS 1100D but one day suddenly it showed "card cannot be accessed.Reinsert/change the card or try formatting the card with the camera.". I tried a 16 GB card but it again showed the message. when I used a 4 GB card it worked perfectly with my camera and sorry for my poor english.

marked as duplicate by scottbb, inkista, MikeW Mar 3 '17 at 19:44

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Reformat the card in the camera. Usually this happens “suddenly” because either

  • the card went bad
  • the card was used on the computer and left in a state that the camera doesn’t like.

This action will fix the latter and help verify the former.

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