Canon IXUS 990IS - Manual (Page 22)

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Before you use a new memory card or one that has been used in other
devices, you should format the card with this camera. Formatting (initializing)
a memory card erases all data on the memory card. As you cannot retrieve
the erased data, exercise adequate caution before formatting the memory
card.
Display the menus.
● Press the n button.
Select [Format].
● Press the qr buttons to select the 3 tab.
● Press the op buttons or turn the  dial
to select [Format], then press the m
button.
Format the memory card.
● Press the qr buttons or turn the  dial
to select [OK], then press the m button.
The memory card will be formatted.
When formatting has finished, the menu
screen will reappear.
Formatting Memory Cards
Formatting or erasing data on a memory card merely changes the file
management information on the card and does not ensure its contents
are completely erased. Be careful when transferring or disposing of a
memory card. When disposing of a memory card, take precautions such
as physically destroying the card to prevent personal information leaks.
The total capacity of the memory card displayed in the formatting screen
may be less than indicated on the memory card.