Canon EOS-1D X Mark III DSLR Camera (Body Only) - Manual (Page 63)

Caution
When the access lamp is lit or blinking, it indicates that images are being
written to, read from, or erased from the card, or data is being transferred. Do
not open the card slot cover during this time. To avoid corrupting image data
or damaging cards or the camera, never do any of the following while the
access lamp is lit or blinking.
• Removing the card.
• Removing the battery.
• Shaking or striking the camera.
• Unplugging or plugging in a power cord
(when using optional household power outlet accessories).
If the card already contains recorded images, the image number may not start from
0001 (
).
If a card-related error message is displayed on the screen, remove and reinsert the
card. If the error persists, use a different card.
If you can transfer images on the card to a computer, transfer all the images and
then format the card with the camera (
). The card may then return to normal.
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