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DCF standard
DCF standard has the following requirements:
Directory (folder) name
Directories must be created under a DCIM directory.
• Data located in directories other than "DCIM" directory is not recognized.
A directory name must be made of "a three-digit number (directory number) + 5
alphabets" (e.g. 100abcde).
• Numbers between 100 and 999 can be used for a three-digit number and 37
different characters can be used for 5 alphabets including 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, _(under bar). (The
name is not case sensitive. Double-byte characters cannot be used.)
Multiple directories with the same three-digit number (directory number) cannot be
created.
Layering of directories is not supported.
File name
A file name must be made of "4 alphabets + a four-digit number (file number) + .jpg
(extension)" (e.g. abcd0001.jpg)
• 37 different characters, including 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f, g, h, i, j, k,
l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, _(under bar) can be used for 4 alphabets and
numbers between 0001 and 9999 can be used for a four-digit number. (The name
is not case sensitive. Double-byte characters cannot be used.)
Multiple files with the same four-digit number (file number) cannot be created in the
same directory.
File format
Only Exif2.1-compliant JPEG image is supported.