Canon PowerShot SX400 IS User Manual page 174

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Low-level formatting takes longer than "Formatting Memory
Cards" ( = 172), because data is erased from all storage regions
of the memory card.
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You can cancel low-level formatting in progress by choosing
[Stop]. In this case, all data will be erased, but the memory card
can be used normally.
File Numbering
Your shots are automatically numbered in sequential order (0001 –
9999) and saved in folders that store up to 2,000 images each. You
can change how the camera assigns file numbers.
Continuous
Auto Reset
Images are numbered consecutively (until the
9999th shot is taken/saved) even if you switch
memory cards.
Image numbering is reset to 0001 if you switch
memory cards, or when a new folder is created.
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Choose [File Numbering], and
then choose an option.
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