Canon 40D and 64Gb CF Card

at the command prompt (pc/notebook) type chkdsk x: /f where x is your flash card

check for bent CF pins. make sure there is room on the CF card.

busy is normal

Replace the cf card.

My 40d keep saying the cf card is not formatted. I used three different cards and it says the same thing. Is it anything I can do to fix this problem.

You need to use the card reader the came with the Eye - Fi card as this has some sort of code in it that runs when the Eye-Fi card is inserted

using my computer on a pc open your cf card and then click on 101 directory your photos should be inside this directory.

Try formatting it on your computer...make sure you are formatting "that" drive and not your C drive.

Take a look inside your camera's CF card slot. I suspect that you may have a bent pin in there. If so, don't fret. Although professional repair would be more costly than the value of the camera, there is a very good chance that you can repair this yourself. Please see the following: http://camerarepair.blogspot.com/2009/06/fixing-compact-flash-memory-card-error.html

Error 99 can mean many things. Have you installed the latest firmware for the camera (version 1.1.1)? If you don't have, download it here (for equipment purchased in USA or Puerto Rico):

http://web.canon.jp/imaging/eosd/eos40d/eos40d-firmware-e.html

If you have the latest firmware, try this:

1. Switch off the camera and remove the CF card and battery
2. Keep the camera idle for 30 min
3. Clean all the contacts of the camera (battery contacts, lens contacts etc) with an eraser. Do this keeping the camera facing down so that no debris fall into the camera.
4. Attach the lens and insert the battery.
5. Switch on the camera
6. Insert the CF card
7. If the error persists, format the card again
8. If this does not work, try using another CF card.
   

Try the following diagnosis steps: -

To isolate the cause of the issue, do the following: -
1. Turn off the camera.
2. Remove the lens, battery, and CF card.
3. Allow the camera to sit without power for approximately 20 minutes.
4. Insert only a fully charged battery, and turn on the camera.
5. Depress the shutter button as you would to take a picture.

Does the “ERR 99" message appear? If so, the camera may be faulty and requires a service. If it does not, then: -
1. Turn off the camera.
2. Insert the CF card.
3. Turn on the camera.
4. Format the CF card in the camera.
5. Depress the shutter button as you would to take a picture.

Does the “ERR 99" message appear? If so, then the CF card is faulty. Try a different card. If the message does not appear: -
1. Turn off the camera.
2. Clean the gold contacts on the lens by GENTLY rubbing them with a pencil eraser or soft cloth. Keeping the camera face pointing down, also clean the gold contacts on the camera, being careful that you do not let any debris fall into the camera body.
3. Reattach your lens.
4. Turn on the camera.
5. Depress the shutter button as you would to take a picture.

If the “ERR 99" message only appears when one particular lens is attached, then that lens should be examined by a service technician.
If you see the “ERR 99" with a different Canon lens attached, then the camera is faulty and should be serviced.