Nikon COOLPIX-A - Manual (Page 211)

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U
When a photograph is taken, the camera names the file by adding
one to the last file number used. This option controls whether file
numbering continues from the last number used when a new
folder is created, the memory card is formatted, or a new memory
card is inserted in the camera.
File Number Sequence
G button
➜ B setup menu
Option Description
On
When a new folder is created, the memory card formatted, or a
new memory card inserted in the camera, file numbering
continues from the last number used. If a photograph is taken
when the current folder contains a photograph numbered 9999,
a new folder will be created automatically and file numbering
will begin again from 0001.
Off
File numbering is reset to 0001 when a new folder is created, the
memory card is formatted, or a new memory card is inserted in
the camera. Note that a new folder is created automatically if a
photograph is taken when the current folder contains 999
photographs.
Reset
Resets the file numbering for On to 0001 and creates a new
folder with the next photograph taken.
D
File Number Sequence
If the current folder is numbered 999 and contains either 999
photographs or a photograph numbered 9999, the shutter-release
button will be disabled and no further photographs can be taken.
Choose Reset and then either format the current memory card or insert
a new memory card.