Sanyo VPC-HD1E - Manual (Page 146)

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i If Card B already has image data in it when it replaces Card A, file
numbers are assigned as follows.
When the highest file number on Card B (before replacing) is lower
than the highest file number on Card A: the file number of the next
recorded image continues from last file number recorded on Card A.
When the highest file number on Card B (before replacing) is higher
than the highest file number on Card A: the file number of the next
recorded image continues from last file number recorded on Card B.
Card A 0001, 0002 ...... 0012, 0013
Card B 0001, 0002, 0014, 0015 ...... 0025, 0026
Previously recorded files
Replace card
Card A 0001, 0002 ...... 0012, 0013
Card B 0020, 0021, 0022, 0023 ...... 0025, 0026
Previously recorded files
Replace card