Depends whether you have selected Lock when Full or Wrap when Full for the Buffer Mode. If you have selected Lock When Full, the capture will stop when the the buffer is full. You can then Save the Buffer and download it in the form of sniffer file and start you capture again. This will over write the old data. If you have selected Wrap when Full, then it will continue the capture when the buffer is full. The oldest packets are discarded as new packets arrive.
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