Set the file name or file number according to the Design rule for Camera File system standards

If the folder structure on the memory card has been altered somehow or the image file name has been renamed (usually when the card is inserted into a card reader connected to a computer), the image file may not be seen by the camera.

Here are the Design rule for Camera File system standards, as defined by the Japan Electronics and Information Technology Industries Association standard JEITA CP-3461, " Design rule for Camera File system standard DCF Version 2.0", 2003.

File Folders

• The directory with the name "DCIM" directly under the root directory is called the DCF image root directory.  DCIM stands for "Digital Camera IMages". The DCIM folder must be present on the root of the memory card.
• The directories that store DCF objects are called DCF directories. They are created directly under the DCF image root directory (DCIM folder). The directory names conforming to the following rules are called DCF directory names.
• • The directory name is 8 characters in length.
  • The first three characters are a number between "100" and "999"; numbers "000" through "099" shall not be used. This number is referred to as the directory number.
  • The rest of the name after the directory number shall be five characters. These are referred to here as the DCF directory name Free characters.
  • These five characters consist only of the upper-case alphanumeric characters (A - Z), (0 - 9) and the underscore "_" character. If an existing directory or file name uses lower-case letters, they shall be treated as all upper-case letters.

File names

File names conforming to the following rules are called DCF file names.

• The file name is 8 characters (not including the file extension).

• The first four characters consist only of the upper-case alphanumeric characters (A - Z), (0 - 9) and the underscore "_" character. If an existing directory or file name uses lower-case letters, they shall be treated as all upper-case letters. These are referred to as the DCF file name Free characters.

• The four characters that follow are a number between "0001" and "9999". "0000" shall not be used. These four digits are referred to as File number.

For more information, see http://tsc.jeita.or.jp/avs/data/cp3461.pdf