I was shooting at night and switched my cf card. i must have accidentally pushed something... because i couldn't get it in! nothing looked out of place. when i shut the door and turn it on, the display said there was something wrong with the card (even though there was no card) and to put a new card in. i am a helpdesk tech and i am completely stymied. help help help!!!!!!!
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What you require is to format the Compact Flash Card. The CF card should be formatted when new and after every download. Format the card in the camera it is going to be used it. Constantly deleting pictures on the memory card will cause major corruptions and total failure. Formatting cleans the memory and allows the camera to communicate properly with the CF Card. I going to give you several diagrams on where to go in your camera to format. these diagrams are screen shots right from your manual.
If your camera uses a compact flash card, then something is wrong with it. Possible causes:
card needs formatting in camera (this will erase it)
one or more pins inside camera are bent.
Card was erased or formatted on computer instead of camera.
Pull the cf card out and with a careful eye (maybe a small flashlight and magnifier) look down the slot and check to make sure none of the cF card receiving pins are bent... it happens and it'll give you a card error. Regretfully if this is the case, it'll need a repair, replacement parts are available but it is a little techie to get apart and swap parts... Check the pins... good luck on this..
This is the camera writing to the CF memory card. Perhaps your card is a lttle slow, so you will see the message. I use the Sandisk Ultra II CF, labelled as 15Mb/sec and it is very very fast indeed - I don't have any lag with my XTi.
Try a different CF, if it is fast enough, the message will go away. Ensure you format the card on the camera too.
I had the same message on my EOS/Rebel XTI and the camera shop concluded that one of the pins where the card is inserted into the camera had come loose. They sent the camera back to Canon for repair. Luckily, it was still under warranty at the time.
There have been several reports of CF cards that work with all cameras, except the Rebel XTi. It depends on the actual manufacturer of the card. Canon made a change mid-production that affected the data saving. Try another brand of card & you should not have that problem any more.