Reference Manual

280 Menu Guide > A Custom Settings
When a picture 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.
d6: File Number Sequence
G button ➜ A (Custom Settings menu)
Option Description
On
File numbering continues from the last number used. This
simplifies file management by minimizing the occurrence
of duplicate file names.
Off
File numbering restarts from 0001 or from the largest file
number in the current folder (if you turn sequential file
numbering off and then on again, file numbering will
resume from the last number used).
Reset
As for On, except that the next picture taken after Reset is
selected 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 a picture is taken when the current folder contains 5000 pictures or a
picture numbered 9999, a new folder will be created and file
numbering will restart from 0001. The new folder is assigned a number
one higher than current folder number or, if a folder with that number
already exists, the lowest available folder number. If the current folder
is numbered 999, the camera will not be able to create a new folder
and the shutter release will be disabled (in addition, movie recording
may be disabled if the camera calculates that the number of files
needed to record a movie of the maximum length would result in the
folder containing over 5000 files or a file with a number over 9999). To
resume shooting, choose Reset for Custom Setting d6 (File number
sequence) and then either format the current memory card or insert a
new memory card.