Canon 1D X - Manual (Page 56)

56
Before You Start
The card is new.
The card was formatted by a different camera or a computer.
The card is full with images or data.
A card-related error is displayed (p.388).
Format the card in the following cases:
Cards with 128 GB or lower capacity will be formatted in FAT format.
Cards with a capacity over 128 GB will be formatted in exFAT format. If
you format a card with a capacity over 128 GB with this camera and then
insert it into another camera, an error may be displayed and the card
may become impossible to use. Depending on the personal computer’s
OS or card reader, it may not recognize a card formatted in exFAT
format.
When the card is formatted or data is erased, only the file management
information is changed. The actual data is not completely erased. Be
aware of this when selling or discarding the card. When discarding the
card, destroy the card physically to prevent personal data from being
leaked.
The card capacity displayed on the card format screen may be smaller
than the capacity indicated on the card.
This device incorporates exFAT technology licensed from Microsoft.
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