#4. "RE: Nikon D5100 File Names" In response to In response to 3 Tue 09-Aug-11 12:33 AM by gkaiseril
Have you read the description for "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."
This option allows the "file numbering to continues from the last number used" no mention of existing files. The description continues, "or from the largest file number in the current folder, whichever is higher." so if there is a folder and there is a file with a higher number than the last number used by the camera, the next higher number will be used.
Since the file name only support 4 numeric digits, there has to be a solution when the file name number reaches 9999. At that point a new folder is created and the file numbering name starts over at 0001. There is a shutter actuation count within the camera and recorded within your images that can count well over 100,000. If you get to 10,000 images, you should have developed a storage and naming scheme that will resolve this camera limitation. This naming restriction is not a Nikon imposed limitation, but an industry wide standard.
You might want to try this option and see how it works.