Creating Custom Image Folders with a Nikon D3100 or D5100
By default, your Nikon D3100 or D5100 initially stores all your images in one folder, which it names 100D5100. Folders have a storage limit of 9999 images; when you exceed that number, the camera creates a new folder, assigning a name that indicates the folder number: 101D5100, 102D5100, and so on.
If you choose, however, you can create your own, custom-named folders for your Nikon DSLR. For example, perhaps you sometimes use your camera for business and sometimes for personal use. To keep your images separate, you can set up one folder named DULL and one named FUN (or perhaps something less incriminating, such as WORK and HOME).
Whatever your folder-naming idea, you create custom folders like so:
Display the Shooting menu and highlight Storage Folder.
Highlight New and press the Multi Selector right.
You see a keyboard-style screen.
Enter a folder name up to five characters long.
Use these techniques:
To enter a letter, highlight it by using the Multi Selector and then press OK.
To move the text cursor, press and rotate the Command dial in the direction you want to move the cursor.
To delete a letter, place the cursor under it and press the Delete button.
After entering your folder name, press the Zoom In button.
You return to the Shooting menu, and the folder you just created is automatically selected as the active folder.
If you take advantage of this option, remember to specify where you want your pictures stored each time you shoot: Select Storage Folder from the Shooting menu and press OK. Highlight Select Folder and press the Multi Selector right to display a list of all your folders. Highlight the folder that you want to use and press OK. Your choice also affects which images you can view in playback mode on your Nikon D3100 or D5100.
If necessary, you can rename a custom folder by using the Rename option on the Active Folder screen. The Delete option on the same screen enables you to get rid of all empty folders on the memory card.