Canon POWERSHOT SD630 DIGITAL ELPH User Manual page 34

You should always format a new memory card or one from which
you wish to erase all images and other data.
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eTo perform a ow eve format, use
the ,IF button to select [Low Level
Format] and the ÷ or ._ button
to add a check mark.
eYou can stop formatting a card
when Low Level Format] is
selected by pressing the FUNG./SET button. You can still
use a card without problem when formatting is halted, but its
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Low Level Format
We recommend you select [Low Level Format] when you think
that the recording/reading speed of a memory card has
dropped. A low level format may require 2 to 3 minutes with
some memory cards.
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