Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 511)

511
Formatting Memory Cards
If the card is new or was previously formatted (initialized) by another camera
or computer, format the card with this camera.
o 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 [ 5 : Format card].
2 Format the card.
 Select [OK] .

For low-level formatting, press the <
L
>
button to add a checkmark <
X
> to [Low
level format] , then select [OK] .
o The card capacity displayed on the card format screen may be smaller than
the capacity indicated on the card.
o This device incorporates exFAT technology licensed from Microsoft.