SIGMA DP2x - Manual (Page 115)

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WARNING !!
z When Folder numbering / File numbering is reached to
“999-9999”, even if the card has the capacity, the message of
[Card Full] will be displayed and it is not possible to take pictures
any more. Please check the File numbering in reviewing display.
If the file number of “999-9999” exists in the card, please proceed
as follow.
1. Transfer all files in the card to your PC.
2. Format the card.
3. If the [File Numbering] is set to [Continuous], once set to
[Auto Reset].
4. If you usually set [File numbering] to [Continuous], set to
[Continuous] once again.
z If you wish to continue to take pictures with any other card, please
proceed it from step 3.