Canon A420 - Manual (Page 31)

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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.
Low Level Format
You should select the [Low Level Format] option if you
suspect the read/write speed of a memory card has dropped.
A low level format may require 2 to 3 minutes with some
memory cards.
Formatting Memory Cards
Please note that formatting (initializing) a memory card
erases all data, including protected images and other file
types.
1
(Set up) Menu (Format) FUNC./SET
button.
See Menus and Settings (p. 22) .
2
Select [OK] and press the
FUNC./SET button.
z To perform a low level format, use
the S button to select [Low Level
Format] and the W or X button to
add a check mark.
z If [Low Level Format] is selected,
you can cancel formatting partway by pressing the FUNC./
SET button. You can still use the memory card without
problem even if formatting was halted partway, but the data
is erased completely.