Nikon D7000 - Manual (Page 238)

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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.
d8: File Number Sequence
G button
➜ A Custom Settings 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 or
from the largest file number in the current folder, whichever is higher. 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.
J Reset
As for On, except that the next photograph taken is assigned a file number by
adding one to the largest file number in the current folder. If the folder is empty,
file numbering is reset to 0001.
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 for Custom Setting d8 (File number sequence) and then either
format the current memory card or insert a new memory card.