Formatting, Then format the card with the camera, The card may then return to normal – Canon EOS-1D X Mark III DSLR Camera (Body Only) User Manual
Page 758: Before recording movies is recommended, If you format the card, The protected images will also be erased, Card formatting, Format card
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Card Formatting
If the card is new or was previously formatted (initialized) by another camera or computer,
format the card with this camera.
Caution
When the card is formatted, all images and data on the card will be erased.
Even protected images will be erased, so make sure there is nothing you
need to keep. If necessary, transfer the images and data to a computer, etc.
before formatting the card.
1.
Select [ : Format card].
2.
Select a card.
[
] represents card 1, and [
], card 2.
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