Canon IXUS 85 IS - Manual (Page 168)

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You should always format a new memory card or one from which you
wish to erase all images and other data.
If you change the date and time when the World option is
selected, the Home date and time will also change
automatically.
Formatting Memory Cards
z Please note that formatting (initializing) a memory card
erases all data, including protected images and other file
types.
z When the icon is displayed, sound data recorded with the
sound recorder exists. Exercise adequate caution before
formatting the memory card.
1
Select [Format].
1. Press the button.
2. Use the or button to select
menu.
3. Use the or button to select
[Format].
4. Press the button.